I wanna know, Is phpBB3 compatible with zymic hosting? Cause everytime I try to upload it to the database, I get an "access denied" error. I'm pretty new to databases and phpBB3 in general. So if I'm missing anything please tell me.

yes phpBB3 works here. There are countless tutorials around the forums explaining the process of installing it here.

Written Tutorials

Tutorial 1
Tutorial 2

Please Search before posting any questions, thank you

I did a search, I just couldn't seem to find what I was looking for. My apologies.