This is a real-time editor for FM 2013. It has worked for me, but there has been an update since I last played the game so I do not know for sure.
You can use this to edit everything about your team, your players, your country, your profile... all of it.
Just be careful of what you do. If you make a super team, your players are going to know that they're uber and want to leave if you play in a low ranking team - and if you play in a premier team, you'll get them demanding re-negotiation of their contract to salaries in the 20Mil mark.
If you do it, make sure you edit the teams wage limit and allowance.