[kh99]

Originally Posted by chefy

Is there any way in how I can link to that page without the need for the user to write his own email address?

You could do it, but you'd need to write a plugin that looks up the email from userid.

Or, even better, is there a way so he can click on "click here" and automatically send him a copy of the activation email and just show him the confirmation page with the "you're being redirected" message?

I don't understand this part of your question. It kind of sounds like you want to bypass the email (you can of course turn off email verification if you want).