How can I make the missing block to appear

I read this.
There is this block. file0

But in my project the block is not appear.

How can i do?

You have to make it by dragging out the second block onto your blocks editor, name it "inject" and add the variable "id" to it using the mutator.

thank you
Than how can make join block to change like this?

Right click on the block and select inline input

thank you so much

But the line is appear only two.
how can i increase line to 4.


This way
add as many strings as you like