Help, I want to add three buttons when compiling, how do I add them?

Questions
1

Help, I want to add three buttons when compiling, how do I add them?

2
3

I want to specify io18 as button 1 Pushbutton, IO19 as button 2 Pushbutton, and io22 as button 3 Pushbutton ，sound input pin manager Microphome type: Generic i2s is selected by default, what should I do?

4

Use Settings to configure them.