ATLAS.ti automatically creates a user account based on the name that you use on your computer.
From the main menu, select Project > User Management > Show User Manager.
A reason for creating a new user account is for instance if two persons on a team have the same name, or if you want to use a different name than the automatically assigned name.
In the User Manager, click on the plus (+) button and enter a user name. You can set a password, but it is not required. Click ok to save the new user.
If you have been working on different computers and use different user names, there could be two or more user names that all refer to the same person. You can simply merge them in the User Manager by dragging the user account you do not want to keep onto the user account you want to keep.
From the main menu, select Project > User Management > Change User. Open the drop-down menu next to the user name and select a different user. Click ok.
When merging projects that come from different computers and that use the same user name, the user name will be duplicated, e.g. Tom and Tom (2). This means you can still distinguish the two users. However, it may be a bit cumbersome to always remember who is who.