The address for the parking lot at OSU (at Ohio Stadium) is:
1935 Tuttle Park Place
Columbus, OH 43210
A link from Google Maps may help you understand how to get to the parking lot.
Here's a view of the Stadium as you approach the lot:
Parking in regular parking spaces is covered through the spectator admission fee to the facility. Parking meters are NOT covered by this arrangement. Nor are the parking garages. To insure that OSU parking is aware of your attendance at the Zones event, place the pass on your dashboard.
Once you park in the lot, the pool is further down Tuttle Park Place in the direction you drove from Lane Avenue. The prominent feature is the red-colored walkway above the ground:
Walk under the walkway and up the incline. The McCorkle Aquatic Pavilion is the silver colored building directly ahead:
Enjoy your visit to The Ohio State University.