Hi @momincanada
Do you mean that you can't remove the agitator nut off the transmission shaft?
Try spraying the nut with WD40 and allow it to penetrate for some hours (even a day) before trying to undo it and check if that works.
Here's a link which has a [https://www.partselect.com/PS334641-Whirlpool-285785-Clutch-Assembly.htm?SourceCode=21&SearchTerm=11023832100&ModelNum=11023832100|video] that shows how to replace the clutch in your model washer.
If you do get it off, search online for [https://www.google.com/search?client=firefox-b-d&q=285785|285785] to find clutch suppliers that suit you best. (examples only)