How do you Reconcile within QuickBooks?

Here are the steps:

• On the Banking menu, click reconcile. 
• Now take your bank statement, enter the ending balance and any service charge (enter bank service charge for the acct. to apply this cost) or interest income (enter interest income acct. for the acct. to apply this cost) and then click continue. 
• Next check off all checks and debits (matching your bank statement); do the same for your deposits.  At the bottom, you will see a total of the check/debit side and the deposit side, including how many transactions were checked off.
• Then when the difference says zero, click reconcile now and you will have cleared your checks.
• Don't forget to print your report or save as a PDF for future reference (only necessary for the Pro version, Premier saves it for you).