Dynasty mode is VERY broken. It appears that you can edit player ratings, but that is NOT available. Why even make it an option in the setup of a dynasty if the options does not actually exist? I understand not being able to edit NIL players because of potential legal issues but not being able to edit fake players on your roster is ridiculous! One of the features that made past games great was this ability. I deeply regret buying this game early. IF EA had been upfront and said that this feature was not going to be available upon release then I would have waited or not purchased at all.
If you want full featured Dynasty mode, I strongly encourage you to wait until / IF? this is fixed.
So far there have been multiple user reports on the EA Answers website and this request has essentially been ignored and not address.