I entered a mistake in my passcode and now the passcode window will not accept my correct passcode. What can I do?

since i upgraded to ipad 7 ( i think thats what it was) i have been required to put in a passcode every time I open up. ( This is extremely annoying!!) Now since I entered my passcode ( why does it have to suddenly be called a passcode and not password ... as if its not bad enough to have "passwords", IDs,etc etc!!) with an incorrect letter included in it the ipad will not accept my correct password. I am unable to access settings of course so I just do not know what to do. Can someone more ipad litereate than I help me.