As a coach you can schedule an element (message, lesson, action, or workout) to a client's journey.
You will just need to be on the specific client's journey to schedule.
Step 1 - Select the client
Use command K or Search from the Client Dashboard
Step 2 - From the client's profile you will want to be on the client's journey (this looks like a calendar)
Step 3 - Find the day you want to add the message and click the '+' sign on that calendar date
Step 4 - Then you will get the pop-up box to select 'Add a Message'
Step 5 - Here you can select a pre-existing message or create new
Step 6 - Title the message, select the send time, type out your message and then add a message