That's crazy. Are you going to HIRE A DEV for fixing a proof-of-concept app like this? Stop. This is where you should be learning to do things, not hiring a dev for writing such simple small apps for you.

Since you're learning right now, find a framework (best if not PHP, but it can be a PHP framework) and follow the tutorial. You'll learn some "backend", and you'll learn it with best practices and with things in the right place.

So Updrop wasn't made by you and you hired a dev to create it?