Adding ProveSource to your Leadpages landing pages is SUPER easy.
Open your Leadpages page editor
Place your ProveSource snippet in the "Head Section Tracking Code" under Tracking > Analytics.
Save!
IMPORTANT!
If you are using Leadpages with Leadboxes, it is important to have your ProveSource snippet on the Leadbox as well, in order to capture conversions.
More info here: https://support.leadpages.net/hc/en-us/articles/115007582368