I highly recommend disabling the Envolve chat in the lower-right of the forum when viewing the forum from a mobile device. The Envolve chat covers up the "New Topic" link in the bottom of the page in a Section. The Envolve chat also covers up the whole screen in a smaller screen and renders the forum and the Envolve chat very difficult to use.
You can disable the Envolve chat by clicking "Turn Off" as shown in this image:
After disabling the Envolve chat there will be a small square on the lower-right to show the Envolve chat is disabled. If you click on the small box in the lower-right then it will re-enable the Envolve chat.