Help! (Server)

[FumbleHorn]

Ok, I can connect to my server but my friend can't.

Here is my server properties folder -

#Minecraft server properties

#Mon Apr 22 13:16:57 CDT 2013

allow-nether=true

level-name=world

enable-query=false

allow-flight=false

server-port=25565

level-type=DEFAULT

enable-rcon=false

level-seed=

server-ip=

max-build-height=256

spawn-npcs=true

white-list=false

spawn-animals=true

online-mode=true

pvp=true

difficulty=1

gamemode=0

max-players=15

spawn-monsters=true

generate-structures=true

view-distance=10

motd= Adam's Tekkit Server

Pls help!

[miniboxer]

Did you port forward?

[FumbleHorn]

Where can i find out how to port forward?