What methods are there of reporting glitches on this website?

Whenever I find a glitch on this website, I normally just ask about it in this club. There have been some glitches ongoing for months though, so I was wondering if there were better ways to レポート them. Though probably others have already used those methods....

Glitches:
1. We haven't been able to change our プロフィール backgrounds for several months. I haven't tried changing a banner または buying anything else with ゴールド - do those work?
2. I can add gifs in some clubs, but not in others. I think maybe it's to do with whether the club is official または pending.