Tekkit server issue

[hiya1992]

Title: Tekkit server issue

Version: 3.1.2

OS: Windows 7

Java Version: Jre7

Description of Problem:

Hiya all just set up a minecraft server for my mates to play on however they can't join the hamachi ip listed, however they can join to my ip address. The problem is, I have to get rid of the server launcher window to join myself, and i can't therefore use any commands ect.

I tried changing the ip in the server properties, however then i get an error message that the port is already being used and i have port forwarded my router. Any help?

Error Messages:

No error message

Error Log:

No error log.

[UKSp0ng3]

Commands can still be used, just op yourself.

/op YOURNAME using console.

Then in-game, type a command (with a '/' infront of it) and it'll work.

e.g: /kick Notch or /give YOURNAME 241 1