Keep reading about make sure relief port not clog

does anyone have a picture of expain to me where it is in the master cylinder

Thanks

 

Take the cover off and actuate the lever. You will (should) see a spurt of fluid come out. There is a hole in the bottom of the reservoir that you can see.

"Verify proper operation of the master cylinder relief port.
Actuate the brake hand lever. A slight spurt of fluid will
break the fluid surface in the reservoir compartment if all
internal components are working properly."