Hi.
 
To learn how to add authentication, check project 4.2.
 
To add another button, you need to create another card on the HTML file with a new id, depending on the GPIO you want to control. The following is for GPIO 12, you need to change the number to match the GPIO you want to control.

<div class="card">
  <p class="card-title"><i class="fas fa-lightbulb"></i> GPIO 12</p>
  <label class="switch">
    <input type="checkbox" onchange="toggleCheckbox(this)" id="12">
    <span class="slider"></span>
  </label>
  <p class="state">State: <span id="12s"></span></p>
</div>

On the Arduino sketch, you must add the GPIO you want to control to the outputGPIOs array.

int outputGPIOs[NUM_OUTPUTS] = {2, 4, 12, 14};

 
I hope this helps.
Regards,
Sara

Hi very thanks it is working 

Great!
I’ll mark this issue as resolved.
If you need further help, you just need to open a new question in our forum.
Regards,
Sara