I am at school rn, so I cannot check studio. How would I do it in normal admin?

You’ll need to insert the MainModule into your studio, then you’ll see the script with more lines. Can explains how to do this above.

Ok, but my ultimate goal is to add additional admin levels.

Yes, you can do that with the MainModule.

How? I feel like I remember seeing another tutorial for this, but cannot find it now.

This is getting off-topic. I suggest creating a #scripting-support post.