Tap the buttons, it's a bit weird but it works! Personally, I recommend Itchy (specifically in full screen horizontal mode) for this, as it gives you a screen actually designed for mobile.
Original PC version https://scratch.mit.edu/projects/534739405/ Uber for Uber Scratch library for some sound effects @toybonnie4 (my brother) who made Gas'n'Food in his game Swag Cat Music by me via LMMS Rest by me only
