key fob wont program!!

For some reason, the key fob(remote lock) that i bought won't program. the blazer can have it, but it doesnt program it. am i doing it wrong or is there something i am missing?

tell me the steps...

What year Blazer?

its a 1997 new styled body

Try this place,

http://programyourremote.com/

Thanks hernandez3674 !!!!