You can enter whatever you want for Server Name, but I recommend naming it something relevant to the server you're creating. Because that's what I want to make, I'll call mine Minecraft (Paper).
You can leave the Server Description blank, or write something there if you need to.
You need to select a Server Owner. In my case, that would be me, the admin user. I'll search for my email, [email protected] and it should find my user.
Only the "Server Name" and "Server Owner" fields require you to enter information.