MX Simulator

ive been playing elsinore.mxsimulator.com for multiplayer. i see other codes like 19803 port.
how do i connect????
in the text box for multi where do i add this number?? at the start??? seems to be noone on elsinore??

Type it like this 'elsinore.mxsimulator.com: 19801
and replace the '01' in the end by 00, 02, 03, 04, or any other server that I might have forgotten.