I've made a 'small' correction to your reply, just to avoid confusion...Your going to need to look under the dash for the keyless receiver unit.
There is a link from HandA that shows how you would go about installing the receiver unit if you dont have it. Use the install instructions to locate where exactly the receiver unit would be, no tools required for this just open up under the steering wheel and peak you head in. If the receiver unit is there get the codes off of it and order a key fob on ebay for cheap. If the receiver unit isnt there and the wire is still taped up by blue tape, then order a keyless entry from Handaaccessories.com for a good deal and fast service.
It's all real simple to figure out just read the instructions and you'll see its simple.