Do you see the level-up attack pointer? Right above it, click "insert attacks at offset". Then point it to a good chunk of free space, type the number of attacks you want, then click inset. Do not touch the Jambo51 hack unless you know what you are doing!
Now, remember that point we typed in for the new attack bank? Type it into the level-up attack Pointer box and hit repoint. Have fun!
Wait, this will create a new empty bank of just "pounds". So, if you want to just add one move, use YAPE. Otherwise you will have to reinsert all of the old attacks.