If your site has a donation page the homepage will automatically input a Donation Panel below the featured content slider. You can hide this from the homepage by adding the tag
Admin Hide Donation Panel.
You can also show this on pages other than the homepage by adding the tag
Admin Show Donation Panel.
The text can be modified under the headline of the default donation page.
This donation bar is connected to the primary donation page set in Pages > Defaults > Primary donation page