If you created and manage your website with WordPress.com, you can add and manage your UET tag there.
Before completing the following steps at WordPress.com copy your Microsoft Advertising Universal Event Tracking (UET) tag ID. Select Conversion Tracking > UET tags and copy the tag ID.
Make sure you open a new tab and are signed in to your WordPress account.
To validate that your Microsoft Advertising Universal Event Tracking (UET) tag is working in WordPress.com, download and install UET Tag Helper. Go to your WordPress.com website and verify that a UET event is received and that the Tag ID matches the tag ID that you copied from Microsoft Advertising.