315Mhz 12v 4 channel TX/RX kit LB-LS0007

Hello Community Ernie is my name, i don’t know if this is how i ask / post a question if some one could help me please.

I purchased this product from Little Bird but carn’t get the RX to acknowledge transmitter, i press the only button on the pcb which turns LED2 ''on" but it doesn’t pick up the TX, i’m wondering if the RX is working properly as the instructions say that LED2 is suppose to “flash” while its learning the TX, but it simply stays on for several seconds, & an then turns off. ( I should hear the relays clicking)

can anyone help me please.