Can you tell me how?

You just post it that category. So instead of browsing to the destiny section of the forum go to off-topic and post it there. Are you using the app or are you on the desktop site?

The app on my phone

Ok. So when you go from the menu select Community. You should land in the forum index/directory. When you posted this you were in Destiny/All. If you scroll down that index page you will see other categories. There is gaming (which is likely the appropriate place for this post), off-topic, recruitment and some others. You just select which sub forum you want to post in, then from there you just do the same as you did when you posted this one. Easy peasy. Hope that helps. If your post gets attention a ninja will probably move it for you, so this is just for future reference.