Correcting Posted transactions

[glowe]

I'm beginning to input information into PC. I issued a check in Feb using the wrong expense account. I reversed the transaction in fund acctg, made the correction, but used the incorrect posting month (January), I reversed that transaction, have made the correction, but now the balance in the expense account is incorrect for both months January and February. For the month of January the balance has tripled and February has a zero balance.

Please HELP!!!
I've been trying to figure this out all week.