Admins/Owners only feature.
If you are an Admin/Owner, you can register time for another user from the “Register Time” section.
Firstly, you have to activate this option from the workspace menu.
Then, open the Register time dialog:
You should see a brand new user option in the top right corner:
Click on the downside arrow to select the user;
Select project and phase; make sure to enter the amount of time worked and the date;
Click on SAVE ENTRY to confirm.