The code I made will send a nudge to anyone in your list that signs in. To do it for specific contacts, you should read up on IF statements.
The word
Email is a variable and so does not use quotes. It is an argument being passed from the event so that you know which user has signed in. You then use that to open the conversation window and send the nudge.
PS: Try not to double post. Just use the EDIT button to the bottom right of your previous message