How To Quickly Assign An Instrument To A Track?

Sorry, I am posting like crazy but I really want to get going with this thing. I am getting stuck on stupid things.

How on earth do I assign a single instrument to a single Track?

For example, I have created 4 Renoise Instruments: 00 Kick, 01 Chat, 02 Ohat, 03 Snare

I also have four Tracks in my project. Now, I would like to assign instrument 00 to Track 00, Instrument 01 to Track 01, Instrument 02 to Track 02, and Instrument 03 to Track 03

Ok, thanks, makes sense. So any track can play any instrument. I could see benefits from such approach.