An Instruction Manual was not included! [Electronic Drum]

I bought an electronic drum.

I opened the box and tried to assemble it. However an instruction manual was not included!

I searched on the net but couldn’t find it.

I tried to assemble it without an instruction manual, but it was impossible for me.
(I have never assembled a drum kit before.)

So, the assembly has been temporarily stopped.

I contacted the store.

(To be continued)