How do I reserve slots? I run a dedicated server called "KILL ALL ZOMBIES" but when it's full, i can't join. Is there any way to reserve a slot or do you have to buy one.

if you run the server you can add your ip/game name to the list of admins. an admin can join even if its full.

yeah, I run the server, how do I do that? I use Soldat Admin, do I add my game name to "remote admins?"

Should be this:

/adm ip <your ip here>

and if you are in game..

/adm <your case sensitive name here>

its /admip your.ip.address.here
(no space between adm and ip)