"To enforce these provisions" means to make sure that the rules or regulations mentioned in these provisions are followed and respected. Full definition
A minor does not commit an offense if the minor purchases an alcoholic beverage under the immediate supervision of a commissioned peace officer engaged in enforcing the provisions of this code. (dadaponline.com)
Because it's a binding contract, you can enforce provisions in the lease with fees, fines, or other methods. (effectivecoverage.com)
The problem comes with planners enforcing the provision of open space in new developments. (dirt.asla.org)