When did it blow - a) when you switched on the ignition? b) when you shifted into reverse? c) when you put on the left turn signal? d) when you put on the right turn signal?
We are not there, we cannot tell you where the short circuit is, YOU are going to have to find it yourself, or get an auto electrician to assist you - what are your electrical troubleshooting skills like? Do you have a test meter? do you know how to use one?
If the fuse blew immediately you switched on the ignition the short is between the fuse and the turn signal or reverse light switch.
If the fuse blew when you shifted into reverse, the short is after the reverse light switch - check the wiring at the lamp sockets.
If the fuse blew when you tried to use the turn signals, the short is after the turn signal switch - again check the wiring at the lamp sockets.
