If you're tying a streamer with a single rabbit strip, like a zonker, cut the protruding end of the zip tie to a point, make a hole in the rabbit strip at a point where the zip tie would protrude through about 1/4 inch, poke the strip through the hole before securing the strip onto the hook (if the fly is riding hook-up, you'll want to pierce the strip for the hook point first, slip it on the hook, poke the zip tie in then secure the strip at the front).

Regards,
Scott