How to create a Client Pool

From your 'My Hub' page, on the left hand side of your account, select 'Contacts'.

You can then select 'Client Pool' on the dropdown, here is where you will see all of the clients who have not yet been assigned to a trainer.

When you have added the clients you can tick the box on the right hand side by their name and assign them to the trainer of your choice. 

Once the client has been assigned to a trainer, it will move them from the client pool onto the main contacts area. It will be greyed out so you can see that the client is awaiting activation, this will automatically be sent to the client, so they can activate their account and login.