When you click "start" at the bottom of this page, you will be shown a list of the available trainers. Please choose from the list by clicking on the name of your preferred trainer.
You'll then be taken to a schedule when you can choose a suitable date and time with your chosen trainer within the next few days. Click on the time slot you'd like
This will pop up a box where you can enter your membership number and any comments (maybe regarding what you'd like to practice in that session). If you don't have a membership number, there's a link there to sign up - it only takes a moment!