1. Settings --> User Settings
2. General --> "New"
3. Fill out the required fields in the general tab. (Required will be indicated with a red *)
Other information to note:
1. A user will need to belong to groups to provide that user with different levels of access to the application. This can be toggled in the "Groups" tab within user settings
2. A user will need access to the application. You can verify what applications the user has access to by clicking on the "access" tab within user settings.