Adding a client to a series of existing sessions

When you have a series of existing sessions, such as every Monday at 9:00 for 10 weeks, and you want to add a client to those:

Go to the appointment manager (the magnifying glass icon in the top navigation)
Select the Bookings tab
Filter the set using the left hand side panel if necessary
Tap the Select button
Select the bookings (sessions) to which you want to add the client
Tap the icon with the human and the + symbol
In the dialogue, tap the client you want to add, tap another time to select
Repeat for more clients to add if necessary
Tap the Book button to submit