In order to bring an OBS feed into Stage TEN, the director must generate an invite link from the Stage TEN Studio.
Click on the invitation link and follow it in Chrome.
Note: you must keep this Stage TEN Performer page open for the stream key to remain valid (if you close this page, your OBS feed will drop).
The stream key and RTMP server URL are listed under the 'Join' button.
Use the Copy to Clipboard button next to Stream Key and RTMP server url to copy these values, and paste them into OBS.
This should allow you to stream to your OBS feed to Stage TEN.
If it doesn't, look at your OBS settings. Recommended settings can be found here.
NOTE: If the URL and Stream Key values don't appear on the page, you can click the Copy to Clipboard button to make the value available to paste into OBS.