Proper Orientation For Inserting Cd Changer Cartridge?

[Lexucan]

Hi All:

I recently purchased a '93 ES300 that didn't have a magazine (cartridge) for the Pioneer CD changer. I've found a magazine for it but can someone with the same system describe for me which way to insert the cartridge into the changer which is inside the trunk of the car? I don't really want to put it into the player the wrong way and end up with it getting jammed.

Thanks