Renew using Online Catalog

From Catalog use "My Account" near bottom of page

Enter your:
  Library ID - your 14-digit card # without any spaces between the digits
  PIN  - call Library if you have not setup a PIN yet

Click on Current Loans on the left to see all items checked out.

Click on the box to the left of any title you want to renew
Then click on the "Renew" box near top of list

A message will appear at the top stating Items were renewed or
that One or more items cannot be renewed