"smelly" compost is caused by a few things... one is being to wet. Try turning it to aerate it a bit. Add some dried leaves, shredded newspaper or brown paper bags and mix up. Also happens if you have too much green in there - a lot of grass clippings at once for example. you can put it in there, just mix it up with a bit of other stuff. Add more drier items, and mix it up. Don't put meat in there.. it spoils before it breaks up.. stay away from dairy products too. you only really need to turn it once in awhile - the added oxygen helps it break down faster. Once a week - once a month.... whatever you can do is good. Good luck!!!