If you want to change your team's subscription, you need to be an admin of that team.
If you are admin, then click on the sprocket on the right of your team's menu and choose "Manage subscription". You will see this:
Then, click "Change subscription plan" and choose the one you want/need for your team, for example the PREMIUM (annually). Note that if you have a promo code you can enter it in the provided box and don't forget to click on "Apply"
Finally click on "Confirm and proceed to payment"
- If you were under the Premium plan and want to change to the free one, you will benefit from it until the expiry date
- If you update your plan to the Premium version during your free trial period (one month from the date of your team creation), you will benefit from this entire period before