If you want to be able to manage ALL song requests, the streamer needs to add you as a manager of their Nightbot.
What you need to do:
1: Go here - https://beta.nightbot.tv/account/managers
2: Locate your Nightbot user ID in the upper right-hand corner of the page.
3: Copy down your user ID and message it to the streamer.
What the streamer needs to do:
1: Go here - https://beta.nightbot.tv/account/managers
2: Click “New Manager”
3: Copy and paste your Nightbot user ID into the “User ID” field.
4: Click “Submit”
Once the streamer adds you as a manager of his Nightbot, you can now manage his song requests from the dashboard. If you’re not sure how to get to his song requests list: