Dunno if everyone knows this, but when you try to post from an Android device (no idea about Apple devices) it usually won't allow your keyboard to pop up or just won't work. Simple trick to allow you to post is to simply disable Rich text on the reply page. hit reply as normal, and look at the bottom left under the reply box and find "Disable rich-text", and click it. Then you should be able to post from Android devices. Again, I have no clue if this affects apple devices, but it works for Android.