in your servers config-directory theres a file called "adminlist.txt"

/config/adminlist.txt

edit the file and add the steam-id of your wife (for example download it, open with notepad, save and upload it back to server)

example-file:


the first id can be yours, the second line the id of your wife. additional id´s can be added to grant admin-access to your friends.

where to get my steam-id?

1. upper left menu - click on steam, select "settings"
2. in popup-window, look upper right corner, click on "Account details"
3. now in main window, see directly below the headline "account of <your steamname> - you see the STEAM-ID
4. copy the number to your clipboard.

edit:
after changing the adminlist.txt, the gameserver needs to be reloaded.