Connect a circuit on breadboard

[kelvin56484984]

I am learning how to connect a BJT circuit on breadboard.I find this tutorials https://backyardbrains.com/experiments/transistorDesign#prettyPhoto
If I want to remove all the input components ,I connect to a power supply
How to connect the circuit to the ground and provide +9V to the circuit ?

 

[GhostLoveScore]

I don't understand a question. You asked how to connect battery to the breadboard? You want to remove all input components? What does that mean?

 

[jerromyjon]

If I want to remove all the input components ,I connect to a power supply

I don't understand what you mean nor what you intend to do by this.
The input current, same as the speaker, are both set at 1/2 the power source. The speaker is hooked to power and the "input" is hooked to ground. The circuit is a buck-converter amplifier if I'm not mistaken. If you change the "input" range to the incorrect component values and or locations could cause bodily harm.

 

[CWatters]

Are you asking how to change the 9V battery to a 9V mains adaptor?