Help
 

Alright here is the deal. I just bought at 89 Accord DX. It's not in the greatest condition, but it will get me to work and back. I went to go get the emissions done today and I failed HC and CO. My HC was 236 when it should be around 35 and my CO was 5.63 when it should be around .15. I don't know what to do. I think I need to replace my O2 sensor, but don't know a whole lot about cars. I see where it goes into the exhaust manifold but the other end is just dangling, and I don't know where it plugs into.

I'm not big into modding my car, but would like it to run smooth and look nice. Getting it to pass emissions is my first piece of business, but I am interested in doing more. Please help.