I don't know for you, but on mobile, when you want to submit a new subject, you don't have a nice and friendly button at the end of the page as a lot of CMS but only a little ">" on the right top area which is really not user friendly...
HOW to change it by a REAL button, easy to see for newbies ? (we are not all nerd lol)
I meant to reply to this a day ago, but I forgot about it. Anyways. What you can consider is using the build in reward-essentials plugin to accomplish this. Make a group, and then make a rule in the rewards for >= add to group.