Did a tune up on my 92 honda accord and now it won't run.....help

Sometimes the new distributor cap has a different sequence of the spark plug wires. It would have an instructional diagram to designate which wire number goes where. On 4-cylinder Honda vehicles, the #1 sparkplug is all the way to the left or front (in the case of transversely mounted engines). The first thing to go awry in a DIY tuneup is usually the wire sequence.

Now, if you connected a battery during this process, then check/replace the Main/Power Relay/Fuse because you could have hooked it up wrong.

Replace the Main Relay.