How to redo past bank reconciliation - when the bank balance is different

Xuan Ling
Xuan Ling Member Posts: 5
Since the discrepancies become larger and larger, I decided to redo bank reconciliations from 1/7/2015. 
The trouble is the opening balance is 0 which is quite different from the bank balance in chart accounts.
So does anyone know how I can change the beginning balance to the balance in the paper bank statement??
Your help is much appreciated!!