I use it on my phone (iPhone6S, iOS 11.0) and it works OK. I never use any kind of APP to post to a forum. I frankly don’t see the point in using an APP to do what the web browser will do.
This forum software is IMO archaic and BITOG does not even appear to be on the latest version. Pretty much EVERY other forum software platform serves a better mobil version, but still I’ve never had much problem posting to BITOG from my phone, though if I have much to say I will wait till I can get to my computer.
I do really wish they would move to a different more modern software platform.