Either in person at the office or on states camping website
Office in person or more info can be had on the website.
The website is best if you know the campground. If you are unfamiliar with the area; it would be best to go to the park, as they let you look around the campground to find the site you like before reserving.
Yurts are no longer available fyi
It is easy call and see what is available they are very helpful Leanto or campsite for tents. Yurts are available. There are trails to hike and canoes too. Nature stuff to check out. Pick up wood outside the park if you want to have a campfire. Lots along as you get close. Have fun and mak good memories.
I would suggest going in person. The park personnel are very helpful and you can look around the lake check out the camp sites.
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