Lots of people have multiple roles in football. These are all catered for in the Matchday app.
To switch between roles head to the 'account' tab and click 'switch account'.
You will then see all of your roles which will have text describing your relationship to that club.
Depending on the roles you've been assigned/children you've been linked to in Clubs Portal this can be an extensive list but you can filter by age category to narrow this down.
Once you've selected a different role, click 'view account'.
Your Matchday app will then change and show you the app for that team and role.