Go into the Edit tab and scroll down until you see the LNAB field. Next to it is a tiny [edit] - and, as you are the PM, you just click on it and change the LNAB. The ID will change to match. If you have mentioned the ID in anybody else's bio (say, his wife), you need to manually change it.
The UI does not need to be changed. It merely relies on whoever is doing the typing to get it right first time.