Welcome to the community,
@johnlee5 !
To list your domain name go to the link:
https://www.namepros.com/marketplace/sell-domains
It's important to select the right category, according to the type of domain, price range, fixed or auction, etc. There is guidance given at the top of each.
Look over some existing listings before placing listings, as that will give you ideas regarding what information should be provided, and the format.
As well as the domain name, generally include where it is now registered (e.g. GoDaddy or Namecheap), when the registration expires, the price (or starting bid and increment), how you would expect to be paid, and whether you are only open to Push at that registrar, or also would transfer with authorization code to other registrars.
I hope some of this is helpful, and good luck with you domain. Some more experienced may wish to add to what I have written here.
Bob