Looking at your parts, and the wiring diagram you provided.
I would say the blue and brown wires go to number 2, and 3 on your start relay. Doesn’t make a difference which way. The other terminal is for your white wire.
Then the black wire would attach to the overload. Then the wire from the overload connects to the compressor common point.
Then you attach the start relay to the compressor.
Any questions ask. Please let us know how it turned out for you.