To add new initials, a new access should be added.
To edit an existing initial, go to dinnerbooking.com -> General settings -> Access control
Click on the edit logo next to the initial.
Control initial on your computer
In the desktop application, you can control which initials to select from.
Go to Settings in the top right corner, and click Manage initials.
Here is possible to active/remove users, or choose if initials should be selected for every change or not.
The changes will only be for that specific computer.