Login to your Pitchero account.
Hover over your name in the top right corner and then click Membership in the drop-down menu.
You will then be shown the teams you are associated with.
Select the team you are wishing to remove yourself from.
Scroll down the page until you see 'Quick Links'.
Then select 'Leave This Club'.
You will then be presented with the consequences of leaving this club.
If you are sure you would like to leave, click 'Yes, I'm sure I want to leave'.