Honest mistake dude, happened to me too I was like mothafucka wtf's wrong witchu?
You need to put your posting key. You find it in your Wallet in Permissions.
And here comes the second trick.
You have to click on show button to the right and after that on hide.
LoL
I discovered all that by myself nobody told me nothing.
It was like so frustrating. Then I remember I have ADHD and have to dial it a bit back to see steps I missed.
Anyway, hope it helps!