You'd need to explain why you cannot use either of the logins.

So I have tried to set my preferences on both, and I cannot edit my login info on either one to match the other. On either version, I cannot even find the login place so I can set them. Frankly, I downloaded FireFox because it was recommended to me and now I have a lot more glitches and hesitations than I had using Internet Explorer. I did like that I could import my bookmarks, but other than that, I still have problems loading websites.

You'll need to be more specific on what exactly you're doing.

If you're using different Firefox accounts on the two devices, they will never sync with each other.

Marking this topic as 'Solved' while it isn't won't help you either.

For the time being see https://support.mozilla.org/kb/sync-bookmarks-tabs-history-and-passwords-android