Your plan: Free vs Pro

For trainers

Free covers the essentials for up to 3 clients.
Pro (£19.99/mo or £199/yr) unlocks unlimited clients, the Brand Studio (your own theme), Direct Debit memberships, SMS, reports and more — and removes the “Powered by TrainerBook” mark.
Refer other trainers from Settings → Refer a trainer: each one who joins and pays for Pro earns you 10% off for life (stacking to 50%), and they get their first month free.
Manage your plan in Settings → Billing.