Have you edited Privilege Sets? Are you logged in as Admin?
how exactly is this done?
sorry, i kinda new to FMP.
i can't access the Manage Accounts & Privileges window (File > Manage is grayed out).
That suggests that you do not have the file open with a full access password and this would explain why you can't edit the layouts. If you do not have it open with a full access password, you can't open Manage Security and you can't edit the layouts. If you aren't entering a password each time the file opens, you may have set the file to enter a password for you in File Options that limits your access choices. If that's a possibility, hold down the option key while opening the file to force it to ask you for a password. Of course, if you can't remember the password or Admin as the account name with no password entered doesn't open the file for you, you are probably stuck with a file you can't use.
It's a very good idea to make lots of back up copies while developing the file. If you have done so, you can go back to an earlier copy and work with and at least you won't have to start all over.
Another thing that can grey out menu options is a paused script or one trapped in an infinite loop. If you set a script to run when the file opens and it is either paused or trapped in an infinite loop, you may find that certain file options are disabled until you interrupt the script. (Press down command and period keys to intrerrupt a script whether paused or trapped in a loop.)