Your donation form will not allow you to proceed to payment information without first filling out the Tribute field. You don't intend to add a tribute to this donation. Why is it required?
The tribute field on a donation form becomes activated when text is added to the empty content holders. Once information has been added, the Tribute becomes a required field.
This can happen when your browser auto-fills biographical information. If your browser auto-fills your first and last name throughout the form, it will sometimes also add information into the tribute field. This is a browser setting, and not something NetCommunity can alter.
Once all of the information has been removed from the Tribute fields, you should be able to submit the donation form without error.