hazard wire location

[itsasony]

i'm trying to install a central locking kit on my car and i m not sure where to find the wire to connect the hazard light wire to the kit

[vipfto]

behind the switch and central lockrelayis underdrivers side dash nextto fuse box

[itsasony]

so behind the switch i can use that wire..
so when the kit send a signal to the wire it will make the lights blink.
will it stuff up if i make the lights blink + turn on the hazard lights at the same time... because there will be two signals giving power to the wire.

can you explain a bit about the relays for me please.
what does it do and how can i connect to them?