To enter any gifts you receive offline (checks and cash) you must first login to your Participant Center. Then click on the "My Progress" button which will bring up a page showing any donations received. At the far right side of the box titled "Gift Summary" there is a link for "Entering Gifts Received Offline".
This will take you to the screen where you can enter the cash and checks you have received.
Note: It is very important that you enter all of the donor's contact information (full name and address). This not only helps in making sure gifts are credited properly, but also ensures that your donors receive receipts and their names appear on your website.