The instructions are in the eBay listing itself. Here's the words pasted from the listing # you referenced:
-----------
How To Set The Parameter:
1. First Make Sure Relay Operation Mode
2. According To The Operating Relay Mode, The Main Interface (Power Module Will Flash Current Operating Mode; Standard Mode P1.1, Then Come Into Main Interface); Long Press Set Key Two Seconds And Then Looen Enter Selection Interface Mode; By Pressing Up, Down Key To Choose The Mode Setting
(P1.1 ~ P4)
3. After Selecting The Mode, Press Short Set To Set The Corresponding Parameter, Then The Parameter You Want To Set Will Flash
(Op Power In Time; Cl Power Off Time; Lop Cycle Times, "---" Is Unlimited Cycle ); By Up, Down To Set The Parameter Value, Support Long Press
(Increase Or Decrease Quickly) And Press Slightly (Increase Or Decrease Of 1 Unit); After Setting The Parameter Value By Short Press The Stop Key To Choose Decimal Place; Choose The Time Interval (Corresponding Time Interval Is 0.1 S-999 Min); Short Press Set To Set The Current Mode Next Parameter, The Process Is The Same As Above
4. After The Setting Mode Parameter, Press And Hold The Set Button Then Hold The Current Configuration Mode Will Flash, Then Go Back To The Main Interface; Define Success Parameter
Main Interface: When The Relay Does Not Work, It Will Show "000" (No Decimal Point); The Operating State Relay, The Screen Has A Decimal Point
Mode Select Interface: Press And Hold The Set Key To Enter; After Setting, Long Press The Set Button Back On Main Interface
-----------
The translation leaves something to be desired but it is what it is. When you first turn on the module with the DC voltage, the module flashes the "mode" it is in. I can't remember what mine defaulted to, but apparently it is mode P1.1 as that's what you get. I made a short video after resetting my module back to mode P1.1 and a time delay of 0 seconds (again, assuming that is the default factory delay).
Video shows when initially applying DC voltage to module, it flashes whatever mode it is in - in this case mode P1.1. To change the mode, you hold down the 2nd button labeled "SET" for a couple seconds (they call it "long press") which should then show the mode number. Then release the SET button and use the 3rd and 4th buttons (UP and DOWN) to change the mode to what you want...in this case we want P1.2.
Then briefly press the SET button and display should start flashing OP which allows you to select the OPerate time which in this case will be the time delay. Use the UP and DOWN buttons to select the time in seconds. When done setting the mode and OPerate time, hold down the SET button for several seconds (Long Press) and you exit programming setup. The module will remember the mode and timing parameters between power cycles.
There are some more obscure settings that I suppose could lock it up but first try at least to set the mode to P1.2 and to a OP time delay you want (I think you said 5.0 seconds).
