Hey, sorry for not answering sooner, I was sleeping.

No need to do the separate steemit post. It's all done from dlive site.
On the top - right side you have "go live" button
After that, add the thumbnail, tags, language and fill in the other info
Click next
Then you can edit the post that will be automatically (automagically) posted and you'll see new screen where you can start your stream

I hope this helps.