Apt-get :: How to install from HD with apt??

Hi all,
i'm very new to linux so i have to ask this.
I want to run Museek (a Soulseek client) on my dsl maschine, so i downloadet it as a .deb file. I installed the mydsl package for apt but i always get the message: Couldn't find package.
I think apt can't find the local file in the tmp folder from where is run it. So i don't know what to do to install it.
Thx
Mo

sudo su
dpkg -i /tmp/name_of_file.deb

thanx, im not familiar with those things

original here.