99 chevy s10 keyless entry remote

hello i just purchesed a 99 chevy s10  ls ext cab 2 wheel drive 4.3 6cyl . i have bought a good gm remote battery is good in it and , iam trying to program it ,for my door locks , i have some instuctions that came with it but it wont work, iam not sure even if this has a factory system in it for this to work, does some know how to ck, and program this year and type of truck, thanks

if you bought it from a dealer take it back and have them fix it, if you bought it from a person call them and ask them if they know.

and if it looks liek this then its a factory one and your dealership has to program it ive been told