Don't know in the sammy, probably under the dash or in the fuse block.
You could put in another fuse, or get a circuit breaker type, they reset
when they cool down, and they don't blow fast like a fuse does.
When you push the horn you should hear a clicking sound, that will be
the relay, and if the horn is disconnected you should be able to hear it
if there isn't too much noise outside