League App ... entering scores (Admin rights)

I just did some really brief testing, but it looks like you can set it up so a user can edit/delete their own rows, and you can also have an admin sheet that contains the administrator emails. Then use the edit filtering to allow only the creator of the row and the admins to edit/delete data. Adding is up to you. Either have a separate section in your app that only admins can access, then provide a form button to add records to any sheet.

Here’s some useful information about setting up admin rights prior to the new feature updates:

I also have an Admin example in https://concepts.glideapp.io/ that is admittedly a bit outdated, but may help give you some ideas.