KEYLESS REMOTE PROG

Anyone have instructions on how to program a remote for a chevy

I was looking for replacement keyless entry remotes not too long ago and I found a site that had them for $29.99 for my Astro. 

 I had them delivered in less than a week and the programming instructions only took maybe 10 seconds?

Anyways, here's a link to the site:

Https://www.ThePartsYouNeed.com