Settings > Account & Subscription (Global Settings)
You should use the Account & Subscription page to:
Update your personal details
Update your login email address
Update your password
Change your subscription type
Update your credit card details
Cancel your subscription
Billing and subscription
If you're subscribed to the monthly plan but want to change to the annual plan, you can do so while the monthly plan is still active. You'll only be charged the annual price minus the remaining days on your monthly plan. Same applies to Master Plan (monthly or annual subscription)