My pioneer radio in the car I recently bought hasn't worked since the car was having some cylinder misses. But I got those fixed and now I can't get the radio to turn on at all I think it's a fuse but I don't know where the radio fuse is and the car unfortuney didn't come with an owners manual or anything so please help me!!

You will have to look in the fuse box. Pioneer is an aftermarket unit, look also for line fuse.

See if this helps:

Fuse Testing

1. Multimeter. Set multimeter to DCV, turn ignition switch to ON (Position II), touch the black test lead to ground, and touch the red test lead, in turn, to each test point on the fuse. The meter should record 12+ volts. Voltage must be recorded at each test point on a fuse; otherwise, the fuse is bad.

An alternative method, which is very fast, is to set your multi-meter to audible ohms, DISCONNECT THE NEGATIVE BATTERY TERMINAL (or you could blow the fuse in the multi-meter), and touch the red and black test leads to the test points on each fuse. When you hear the meter buzz, you know the fuse is good. This is my favorite method. If your meter doesn't have audible ohms, but it does have ohms, you can still use this method--just read the meter instead. The alternative methods perform a continuity test on the fuse. Just remember to de-energize the circuits, by disconnecting the negative battery terminal, and record any radio activation codes first.

2. Test Light. Turn ignition switch to ON (Position II), connect alligator clip to vehicle ground, and touch the probe to each test point on the fuse. The test light must come on at each test point on a fuse; otherwise, the fuse is bad.

These methods allow you to accurately and quickly check all under hood and under-dash fuses in several minutes, even in dark, cramped locations. They eliminate the possibility of removing and replacing the fuse in the wrong slot. Should a fuse test bad, use the fuse puller, provided in the under dash fuse/relay box, to remove it.

Important Note: Due to corrosion, it's not uncommon for fuses to be good but not pass current, particularly in trucks. In this situation, clean the fuse's contacts with No. 240 abrasive cloth, or steel wool, and lightly coat with dielectric grease. Ensure fuse boxes are "Military Ready" for any environment.