It can be found as a switch on the bottom of the upload page. Here's a link to the ongoing thread about it, where you can reach the dev of the app for beta testing and bugs if you don't want to go through the marketplace
Sometimes i feel people post links just to get likes and thanks on this thread, for God's sake, CHECK THE LAST UPDATED DATE OF THE APP BEFORE POSTING HERE!!!!
If you managed to update an app a month after its released that doesn't mean the update was released that day. Mods seriously need to step in to keep this otherwise helpful thread clean.