i have a 93 r32 gtst with a s1 rb25det swap, i bought this car mid swap and am trying to finish it up. im new to nissans and haven't a clue whats what haha

please can you help me figure out what these are, im a noob at this lol.

1. blue 4 prong plug attached to the wire harness
2. green relay(guessing) attached to the car
3. big white/tanish plug, cant find where it plugs
4. white relay(guessing again)

the blue plug wont fit into either one of the of the relays




thanks in advance