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I got mid pipes for a cat back exhaust, but the pipe ends abruptly with a flange on the end to bolt on to something, but theres nothing to bolt on to. How can I fix this?

 
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so you have 1 flage after the cat, then mid pipe, then at the end of mid pipe you have another flage that should connect to a pice of pipe to you're muffler.

 
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assuming on your user name, you have an LX. The midpipe of the EX is different than the other models. The EX has the cat under the car, close to e-brake, while the other models have the cat as part of the exhaust manifold and the midpipe runs all the way down to the manifold. Meaning you probably got an EX midpipe and need an extension to make it fit into your car. I'm sure a good muffler shop can help you with it.