To resend your Intuit Link tax organizer, Edit your Link request (go into document request and add a new item), Save the request, it should send a new email to your client with the update. 

To add the personal questionnaire and document request to your Link request, the client will first need to accept the invite.  Once they accept, EDIT the request and check the box for the personal questionnaire and document request. That should do it!

I don't see the edit link request option or add a new item option. I only see create a new request and that wont allow me to select a client again for whom I have already sent a tax request.