You have to buy a World Pass for him, they can be gotten usually somewhere in the cities..i just know Windurst and Bastok's, Bastok is in port and one of the tents sell them, and Windurst is in the Great Star Tree. The price of the WP is determined by population of server, with more ppl=more gil. Up to 5 uses and one week experiation date.

How to enter? Make new Char, when you put name, then server, press enter(or was it right?) and enter the name of the server EXACTLY like it is, and then enter the pass.