Users
This page allows you to manage users in a number of ways, specifically you can:
Invite New Users
Invite new users by entering their e-mail addresses (individually, or in a list) and choosing their access permission-level from the drop-down menu. If you have an educational workspace, you'll see a link to add classroom accounts.
View User Visits
Check to see when a user last logged-in to your workspace (Hover your mouse pointer over a User's e-mail address and a small box will pop-up identifying their last log-in time, IP Address, and Location).
Modify User permissions
You can modify existing users' access permission-levels via the drop-down menus next to each user's e-mail address:
Remove Users
Remove users from your workspace by selecting "Remove access" from the drop-down menu and then clicking on the "Remove" button that appears.
Workspace Security
When you first set up your workspace, you're asked two questions about security, which manage the ways in which new users can view and edit pages. You can adjust these settings in your workspace at any time by clicking on "Settings" in the upper right hand corner, and then "Workspace Security" on the left hand side.
Who can view this workspace?
Anyone
Choose this option if you want the workspace to be available for reading by anyone on the Internet. This also means that your workspace can be found by search engines and displayed on search results. If you have this question set to "Anyone," then anyone will be able to read your content without logging in.
Only people I invite or approve
This options means that users must be invited or approved for access before they are allowed to see any content on your workspace. Your workspace will not be displayed in search engine results.
Who can edit this workspace?
Anyone with an account
Select this option if you want to allow anyone with a PBworks Account to have editing rights on your workspace page. They will be given Writer level permissions on the workspace. Please be advised that it is very easy to set up a PBworks account, so only enable this option if you want the public to be able to add and edit pages.
Because all new users of the workspace are added as Writers, there is no danger of a user being added to the workspace and deleting all the content. Only editors and administrators have the power to delete content on a workspace.
Only people I invite or approve
This option means that an Administrator of the workspace must add the user to the Users list first. New users of the workspace will have to contact an Adminstrator to edit pages, and those users will have to be logged in if they want to edit.
Request Access
By default, this feature is turned on. When users come to a private workspace, or a public workspace with limited editing, they can request access to join your workspace. Workspace admins will receive a notification asking them to approve the request.
Reader Comments
By default on new workspaces, users with the reader permission level are allowed to leave comments on workspace pages. You can check the "Disable commenting for readers" checkbox to block readers of your workspace from making comments on your pages.
Only users with classroom accounts or PBworks accounts can make comments on your workspace page.
IP Restrictions 
A premium feature. Using the IP Restrictions page in Settings, you can whitelist (ensure access to) or blacklist (deny access to) IPs or CIDRs.
You can find more information on using IP restriction here.
Notifications & RSS
This page will allow you to turn "on/off" e-mail notifications that are normally sent to users when your workspace's page content has been modified. It will also allow you turn "on/off" the ability for users to receive RSS feeds from your workspace. Your users can set more granular personalized notification settings in their PBworks Accounts. See more information about that here: Notifications.
This feature has a video tutorial
This feature is a premium feature
This feature is new/improved