If you ever need to change the Leverage on your account, you would need to make sure you have no open trades on your account before doing so.
You will need to Login and go to the "My Accounts" Tab.
1. Tap on My Accounts.
2. Tap on the account you want to change the leverage on.
3. Tap the 3 vertical Dots.
4. Tap Change Leverage.
5. Select your new Leverage and tap Submit.