How do i use the WinSCP without wi-fi conection

I already jailbreaked my ipod and i have all the programs,i want to put a rom in ipod and in many sites say that i have to download WinSCP to do it ( but i have to use same internet conection in the computer and ipod, but must to be wi-fi, and my internet is like a modem that i conect to my usb ). i also see in many sites to download the iphonebrowser but apears : Iphonebrowser crashed .

I dont now what ti do ?
please ansewer me, thanks ;)