Step 1. Launch FH from the steam page

Step 2. Click play and then click on one of your original maps but DO NOT PRESS START

Step 3. after following step 2, a small option "bar" will apear on the right hand side of your screen



The left option allows you to rename your map, the right option deletes the map, and the central option upload said map to the steam store.

upvote if this helped to help many more clueless people such as us. :)