After a successful transaction, the person using your donation page is sent to a "Thank you" page, and also automatically sent a "Thank You" email with their transaction receipt. Both of these pieces of content are customizable through the admin interface.

First, find the form you want to customize by clicking "Transactions"-->"Transaction Forms" and clicking the "Edit" button on the form that needs editing:

To change the content of the email that is sent as a receipt to all donors, click onto the "Notifications" tab, and scroll down to the "Receipt Email Content" box. If this is left blank, a default message will be sent, with transaction details.

To change the "Thank You" message that is seen by everyone after they run a transaction, click on the "Website Settings" tab, and scroll down to the "Website Thank You Content".

Once you've entered in your content, click "Save".