I know plenty of people are probably going to be asking this question at some point. I'm making this post as much as a link to drop for them as anyone else interested. If you would like to revoke posting authority from your account:
https://steemconnect.com/revoke/@dlive.app
(updated, thanks @drakos)
(Please note that link works for any app if you just change the end to the correct name, which you can find on steemd.com as seen below. Shout out to @followbtcnews witness)
Now this next part is a little annoying, but we're going to have to go to dlive.io and follow these steps:
Click the drop down at the top right after signing in:
Go to each video or stream you want to delete and click edit video:
Click delete at the bottom right. Repeat for each video as an easy way to manage your content clearly doesn't exist on this site.
Hopefully this guide is useful to people that don't want their content getting dragged onto another blockchain and would like to keep it exclusive to the steem blockchain, like me. :)