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I would like to have a "forward to a friend" link on my member's homepages. This link would allow users to enter an email address of someone they think would benefit from signing up to the site by sending them a preview of a member's profile.
You already have a "forward to a friend" link, with template.
Use this as you're starting point and make a copy.
i do?..where?..are you talking about the "invite friends" page?
Yes, make a copy of this, and it becomes not "invite friends" but "forward to a friend".
Change some of the form to make it relevant, so the receiver get's an appropriate message., eg., "Hey, look at what I just found...."
That's just one that springs to mind, and could possibly be used as a starting point, and just one of, I am sure, a number of possibilities, depending upon your coding experience.