Here is my Entry:

https://steemit.com/contest/@newhyt/sponsored-vertex-market-contest-brought-by-monajam

Thanks @monajam for making this app available to us. Sadly, I was not able to use it while posting my contest despite how hard I tried. I've seen others using it here. I think the problem is from my browser. Below is a picture of the error message. I'll continue to try it in my subsequent posts.