Tekkit Classic Friend cant join my tekkit server :(

I can join it, but he cant. He just gets Cant reach server...Were using hamachi...hes on my network...Hes using the technic launcher with tekkit and the same mod pack version thing...He has java 7, and the same version launcher as me... Please help T-T

You may have to open up some ports. Google "port forward minecraft server".

I tried to port forward with two youtube videos...both told me two different things after setting up the network or whatever...Then i couldnt connect to the server,so now im confused...what adid i do wrong? im sure i did something wrong :/