Help with 4 channel relay board

Hello, ive recently bought this relay board on ebay:

but i don't know how to toggle the relays, ive tried to connect gnd to gnd, vcc to 5v, and in1 to pin3 on arduino, but it didn't do anything!
ive just made a basic code to set the pin3 output to high.

what am i doing wrong?

U got the 5V edition ?
see the schematic for Ucc/JDUcc

If U have no external power. check jumper Ucc/JDUcc
With a wire : connect In1 to 5V/GND alternating

ive found what i did wrong, it came without a schematic or manual, but after 30 mins oof trying, ive noticed i had a type-o XD still thanks!