Is there a way I can lock two audio tracks together?

Hi,
Is there a way I can lock two audio tracks together?
I have recorded a song “Run” By Leona Lewis and I have recorded my friend sing. Before I started to record I imported the instrumentle into audacity and then clicked record so underneath the instrumentle the voice was recorded. But now when i edit the voice it knocks it out of sync with the instrumenlte so the instrumentle is infornt or behind the voice. Is there anyway I can lock the voice and instrumentle together ?
Thanks :exclamation:

I have recorded a song “Run” By Leona Lewis

What does that mean? You were in the studio when she sang?
Koz

No a cover!