To do this, add the following code to the default personal page. It is set to detect the participant's personal information to automatically populate the URL, so this is meant specifically to work on personal pages.

<A HREF="Donation2?df_id=[[S42:0:form-id]]&PROXY_ID=[[S48:0:participant-id]]&PROXY_TYPE=20&FR_ID=[[S80:trID]]"> Donate to me </A>

Where "Donate to me" can be replaced with whatever text/image you would like to serve as the link.