If you are logged in as a Studio User license with mobile enabled you should see a menu option called mobile designer, you can change themes, work flows, screen labels, add screens etc. 

Check the following webinar which is dated but a new one is being done in December that you can register for: on the community calendar:  https://www.gotostage.com/channel/87ea09f4ec4c4b1ebb4e278038baa292/recording/73dff017f48348d7b3f945a42f1274dd/watch 

The mobile guide which explains studio can be found in the community at : https://community.ifs.com/fsm-product-updates-114/fsm-mobile-guide-5132

For more complex mobile changes you could look at client scripting, the guide is at : https://community.ifs.com/fsm-product-updates-114/client-scripts-for-mobile-and-smart-client-2289

We strongly discourage customization of the mobile client, however there are guides on how to do it for each platform under the community documentation section, you will also find an ios distribution guide.

Academy offers an FSM Mobile schedule, check the Academy for your regions next classes and pricing.