Projects can be configured via your 'Manage' page (Note: you may need to authenticate here).
From there select the 'Manage Projects' tab. You can either create a new project here or click on the existing project listed to update it.
There are several fields you can update:
Name - the project name.
Description – a brief description of the project.
Status - the maturity or development status of the project. This is informational and won't affect MantisHub functionality.
View Status - whether the project is viewable by all users that can login to your MantisHub (public) or private. Private projects are only visible to users who are assigned to it or to administrators.
Categories - these are used to sub-divide the issues reported in the project (e.g. UI, database, backend, etc). You can have categories specific to a project and you can also have global categories but these are defined outside the project.
Versions – Project versions are used for all version related fields in issues e.g. 'Target Version' & 'Fixed In Version'. This allows creation of ChangeLog & Roadmap reports (see Project Changelog & Project Roadmap for more information). They can also be used to filter issues (e.g. show all blocking issues for version 2.0).
Here you can manage user account for private projects. It lists users that can access the project and their access level. You can use the control/command key to select and add multiple users at once.
The access level assigned here can be different to previous definitions. Hence, a user who has a global access level of DEVELOPER, could be a REPORTER or MANAGER in this specific private project. In public projects, the same field can be used to override the globally defined access level. Check out Creating user accounts for more information.
And you're done! Now you can go get yourself a cuppa :).