if you have the app you can change your availability there, or maybe speak to your manager about getting more hours?

Should be something you can bring up to the manager any time about without any concern (:

At least, my manager is very understanding / accommodating with scheduling. I remember asking about a slight timeframe adjustment a little over 2 months of working there - and she handed me a form to fill out saying what days and what preferred time frame I’d like to work