Links in Profile description

I just discovered when a new member signed up when the member linked from profile to another site it leads the users away. This should open in a new window by default.

Is there any solution for this?

I just don't want to manually sort that out.

if you post a link  to a profile wall then it will open in a new window.

where do you add that link?

It's right at the join form when a new user joins.