Mower was running fine - had to put it in reverse and now the brake/clutch is stuck all the way down - you can change into any gear(which I'm guessing means the clutch is depressed) - will not go into gear though and will not move - How can fix this?

There are several things to check but I would first look at the belt to make sure it didn't break. While you are down there check the spring on the tensioner pulley. The tensioner is between the engine pulley and the transaxle pulley. If everything is Ok come on back.

There is a parking brake lock lever, when pedel is fully depressed lever can be moved to lock it. Find and release lever.

Don