Hello, I recently changed my username but now the Home button (under Computer Tag) on Kirchoff menù is linking old user, how can I change it? Thank you
The user is not identified by the name but by the UID (user ID number) Changing the name does not change the UID so home is still under the old name. ie /home/oldname
If you want a new home directory you need to add a new user with the new name. If you want to keep the old directory but have it known with the new name you need to rename you home directory to the new name.
Also you need to log off then back on or reboot for things like that to take effect.