To add a new user, enter the name ,password, confirmation and roles for the new user and click "Add". Domains is an optional list of domains from which the user is allowed to login.

Name
Password
(Confirm)
Domains
Roles
E-Mail
Full name

Explanation

IssueTracker Manager only is if the user should be able to change the status of issues (i.e. Take, Complete, Delete, etc.) and see the confidential issues.
An IssueTracker Manager can not access the Zope management interface like a native Manager can.

IssueTracker User is very basic meaning the user can at least view the issue tracker of disable for anonymous users but not much else.

Manager supersedes IssueTracker Manager so if you want a user to have full access to everything this is the choice.

Any user can have multiple roles but it shouldn't be necessary since they are all linearly inherited meaning that there's nothing extra an IssueTracker Manager can do that a Manager can't and so on.

'Must change password' means that the first time this user logs in a page will appear for the user asking for a new better password.
This is useful if at this stage set them up with a dummy password (e.g. 'test123') but really want the user to change it to something better.