If you are part of more than one club, you are able to transfer from one club to another within the Club App.
To do this, click on the Account button in the bottom right and then click on Club Selection.
You will then be shown with a list of your clubs, the club you currently have selected will have a tick next to it.
Click on the team you would like to switch to.
You will then see that you have changed to the club you selected.
You can now carry out tasks on this club as usual.