I am struggling to get my sequence to send any messages. 

At first, I set an action in my automation to subscribe the contact to my sequence.

When I go into the sequences, I have set up the messages, but it asks for a trigger. So when I set the trigger to “subscribe to sequence”, it basically sends the messages immediately.

But I don't get what trigger I am supposed to use in the sequence messages? The delay doesn't seem to be working for me, can you help?