In order to run ads via YouTube, you need a YouTube channel that you’re happy to use. If you don’t already have one, create one first using Google’s instructions.
Navigate to Settings > Integrations.
Find ‘YouTube’ in the list and click ‘Connect your ad account(s)’
You will see a disclaimer appear with Google’s API Services User Data Policy. Click Continue to proceed.
Sign in to your Google Account associated with the relevant YouTube channel
Review and allow the permissions; click Continue.
You will see a pop-up with Partners and Advertisers; from here, select the advertiser you want to export ads to, and click Save.
The account will now show as ‘Connected’.