how do i leave a fft ?

@Sneha_reddy Do you have the fantastic 5 custom feature. if so you can just create your own team or press join to look for another team. If you do not have Fantastic 5 custom team, check for update and log out and restart your device , then log back in. Unfortunately if you then still do not have fantastic 5 custom feature you cannot leave the team

How do I create a team?

To create a team is easy, just follow these steps!

1. Open the 'Power-Ups' from the map screen.
2. If it's visible, tap the 'Create' button beneath the Fantastic Five section of the Power-Ups menu.
3. Get creative and give your team an inspiring and unique name. (Remember, nothing you wouldn't want your Grandma to see!).
4. Choose your privacy. You can make your team a publicly visible group, so other people can join - or keep it between you and those you choose to share it with.
5. You'll be assigned the team creator and your player avatar and name will appear on the list.
6. If you are currently a member of a team, you'll automatically leave and become a member of your new one.

How do I join a team? 

1. Open the 'Power-Ups' menu, by tapping the Daily Booster Wheel icon on the map screen.
2. If it's visible, tap the 'Join' button beneath the Fantastic Five section of the Power-Ups menu.
3. The list is separated by two tabs. 'Join team' allows you to view teams, 'Requests' allows you to view any requests received for a team if you've created one. You can also search for a team by typing their name into the Search box.
4. Once you've found the team you'd like to join tap 'Request' and the team owner will receive and respond to your request. It might not be immediate, so keep in mind you may need to wait. Remember, if accepted, you'll leave any current team you're a member of.

You can't leave if you haven't created it !!

@Pitty_Kitty thanks for correcting

I don't have that custom teams feature too !!!

And it strictly implies I can't or haven't made the team !!