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A bureaucrat can add and remove groups using [[Special:UserRights]]. There is a link to UserRights on the list of [[Special:Specialpages|special pages]] and on each user's Special:Contributions view. <br style="clear:both;" />
By default on Wikia, a bureaucrat can grant rollback, administrator, and bureaucrat, and can
remove revoke rollback and admin rights. While bureaucrats cannot directly remove other user's bureaucrat status (please contact Wikia Staff if this is needed), a bureaucrat may remove their own bureaucrat group. Administrators (sysop) have the rollback permissions by included, so adding rollback to administrators grants no additional rights. Some wikis may be able to add or remove additional groups, such as 'bot', or wiki-specific groups.
First enter the user's name (case sensitive!) and click "Edit User Groups". The form shown at the right will be made available. Select the appropriate right(s) under "Groups you can change", fill in "Reason for change", and click "Save User Groups". Make sure you're giving rights to the right person by checking the links to the user page and the contributions! Once you save the form, a confirmation message will display which groups the user is now in, and the change in rights will be recorded at [[Special:Log/rights]].