First you join. Then you click the button on the top right, It says "Publish"
As a scoop, I go to my hub and copy and paste the first paragraph or two. This is what I've seen others do and seems to work fine. Thanks for the reminder-for me to keep backlinking lol, I haven't been there in awhile.
The results/traffic will take about a week to show up on your traffic results.
Another place, reddit , I've had really good results with.