eMail template with a lookup field

eMail template with a lookup field

I am trying to develop an email template for a form per "on submission success" action.  The "submit success" action triggers this email.  

In designing the template, I found that the "lookup field" defined as <%=LOOKUPFIELD%> shows a value of the ID of the related form.   How can I make it shown the other values of the same row on the related form? 
Thanks.