Im trying to get the wife set up with a new account but i dont want to do a trial one because of the limitations.
If i go to the UO account management screen it asks me to enter a registration code.
How can i just pay the monthly fee for a new account
I believe your best bet will be to purchase a new account for the latest release (Stygian Abyss). You can purchase from 2 places that I know of;
UO Game Codes or the
EA Store. Currently the EA Store appears to be $10.00 U.S. cheaper ($19.95 vs. 29.95).
It is also my understanding that after a trial account runs out you may pay to make it a full account, but it will only have access to the release prior to Stygian Abyss. If I recall you simply need to pay for a month of service $11.99 to make the trial account a full account once the 14 days are up.
I don't think that is really the answer you were looking for, but I hope it helps. To me it looks like an New SA Account purchase from the EA Store is your best deal. You will also get the first month of game play free.
Good luck!