Click here to find out how to become a Pro Member/Link

hello,

i would like to know how to change the link "Click here to find out how to become a Pro Member." after where it says: "This feature is limited to Pro Members only." when a non-supporter tries to access a supporter feature.. i want to make it a clickable button/image instead of a text link.

i tried the obvious of changing the html "Supporter Feature Message" in supporter admin already.

thanks.