I am unable to include a forward to a friend link in my campaign.
I have used both the html and text tags suggested but both simply appear within the email without creating a valid link.
Are you using a WYSIWYG type editor? If so it may be that you're adding the tags in the design view, rather than the code view. That would cause the tags to show rather than a link. You just want to ensure that the tags go into the source and then upon import it'll create a link.
If you're still having problems you might try getting in touch and we can take a look at your code.