To vote for the amenities of a dog park, start by heading to the park page you would like to vote for. Once on this page, click on the right tab called "Amenities," and then click on the pencil icon in the bottom right corner.
Once you click on the pencil icon, you will have the option to vote for all of the amenities at the dog park, which will help other fellow dog owners find a suitable dog park for them and their pups.
If something at the park changes, you can update your amenities vote by clicking on the pencil icon again.