My frond windscreenwiper is not functioning. Sometimes the fuse blows. To my opinion it will be the relay. Does anyone know where to find it??

Non functioning windscreenwiper

A dodgy relay wouldn't cause the fuse to blow.
You probably have a seized wiper pivot, or something else causing an overload on the motor.
Do they move at all, and did they just suddenly stop working, or gradually get slower?

Could also be an electrical short of course.
My R/H Hi-Beam used to go off momentarily with the wipers on.
The electrical loom runs really close to the wiper mechanism on the R/H side, and the wiper arm lever was chafing on the Hi-Beam wire with each pass.
It eventually cut right through, and I had to splice a new wire in.

I had this problem once while I was on holiday in Sardegna. Just 2 weeks before I left I was involved in an accident, the damage to the body was repaired, but apparently it had also an impact on the wiper mecahnism. I didn't need the wipers during the week before the trip, but during the trip I had some rain. It blew the fuse immediately, every time. A local dealer took the mechanisme out, cleaned it, lubricated it and is was fine after that. A week later the head gasket went... no idea if it was related to the same accident or just coincidence. Had it fixed in a local shop and could continue the trip (or should I say the odyssee?).