How do you use a server?
To join or "use" a minecraft server you click on Multiplayer
(Assuming that you've purchased a premium account). Then click on
"Add Server" and enter a name for the server you're adding (This
does not matter what you name it, this will not affect if you can
join the server or not.) then copy the I.P. address and paste it
into the box below the name. Hit add server, then double click to
join it.