Open OBS
Go to the scene where you want the ad manager content
Click the plus button under Sources
Select Browser
Name the source
Paste the ad manager URL or embed link
Set the width and height
Click OK
Adjust the source position and size in the preview
If needed, add your ad manager as a dock via View
Select Docks
Choose Custom Browser Docks
Enter the ad manager URL
Click Apply
Log in to the ad manager if required
Test the source or dock before going live