Friends can't play on my server

My server (http://www.minecraftforum.net/topic/1753494-147-survival-server-no-whitelist/) won't work. I have used the port forwarding and I have tried both IPs with and without :25565. It works on all computers in my house but not on my cousins computer. Help?

 

That means you have not port forwarded properly...

 

I figured... I do believe it should work because I look at the site to see if you are port forwarding and it said I can. Everyone who helps me get this working will get a custom non-admin rank on my server.

 

If you want help on how to Port Forward, just search in Google:
"How to Portforward the X Router for Minecraft"
X Being the Router you are using, for example, I use a Belkin router.

If you request personal assistance, please message me on Bukkit.

 

Thanks, I looked it up and found a video showing me what to do and it...worked! So, what rank would you like? My server's IP is 50.141.213.9:25565