Hi there!
You should still be able to use all on-screen buttons without any issues. If you are stuck for good, you must clear the app's data by heading to Settings > Apps > PokeMMO > Storage > Clear Data. This will set everything to their default values.
Other users have to manually press buttons so they don't get disconnected while you're using a third-party software to make your device do the job for you, gaining an unfair advantage over them.
Battle Points are used to buy various items/moves from places like Trainer Tower, Battle Frontier and Battle Station.
On the other hand, Reward Points are used to buy cosmetics and items from the Gift Shop.
There was a server issue that caused difficulties like the one you're experiencing. Now it's been resolved and everything should be working as usual now.
I doubt that's a bug and it's probably used for quick navigation. However, scrolling using a controller might be an issue if you don't have a mouse. You can always make a post in the bug reports section. :)
Hey Vann, nice to meet you too!
You probably misclicked something while updating the client. Try relaunching the updater or download a fresh client here. Good luck on your journey and have fun!
Battle Subway is located in Nimbasa City, right after the Pokemon Center. Hoenn and Kanto also have a BP shop in case you're wondering;
Kanto - Trainer Tower
Hoenn - Battle Frontier
Hi there Hydra, welcome to our community! Hope you enjoy your stay and have fun!
About your question; there's a guide at the download page. Let me know if anything goes wrong.