Updating records of a form based on input of from another form.

Updating records of a form based on input of from another form.

Hello, I have 2 forms.

The first form is a simple product key list, where I import product keys from an excel doc, and then I have a second column to assign a users email to them. 

The second form is where users register.

I have 2 field that are admin view only, First is the application status, where we accept or reject their application.

Second we have a lookup field that shows all the unassigned keys. (meaning they do not have emails associated with them yet)

What I am trying to create is a workflow that will take the user's email that I am assigning a key to and update that key's record automatically on the first form with their email address so they become associated.





I created a simple workflow but I'm getting the error that I can only update subform related fields and will not let me save it.
    1. keyupdate = Access_Key_List[Access_Key == input.Access_Key_List].Access_Key;
    2. Access_Key_List.Member_Email = Your_Email ;
    Please keep in mind I'm not a developer by any means, so any help would be much appreciated! Thanks!