1. Edit/create event registration form
2. Click to expand the Options section
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3. Mark the checkbox to Allow additional donations 

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4. Select the Fund from the Raiser's Edge by clicking on the binolculars, and enter in a  Display Name (this is the text that will appear to registrants completing the form)
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5. Click save


Event Registration Form (Classic)
1.  Edit/create event registration form (classic)
2.  Scroll down toward the bottom of the form editing window

2.  Mark the checkbox to Allow Additional Donations
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3. Select a Fund from the Raiser's Edge by clicking on the binoculars.
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4. Click Save