How can I make the missing block to appear

MIT App Inventor Help
1

I read this. https://puravidaapps.com/inject.php
There is this block. file0

file2
file2514×806 55.6 KB

But in my project the block is not appear.
file1
file1533×806 53 KB

How can i do?

2

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.

http://ai2.appinventor.mit.edu/reference/blocks/procedures.html

3

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

image
image955×74 29.5 KB

4

Right click on the block and select inline input

5

thank you so much

6

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

7

image

This way
add as many strings as you like