How to apply MAC fix+?

Could you please provide me with a step-by-step guide on how to properly apply MAC fix+? I'm curious about the exact method to ensure the best results and would like to know if there are any specific precautions I should take. Is it recommended to apply it before or after my regular skincare routine? Also, what are the key ingredients in MAC fix+ that make it so effective, and how does it help to improve the overall appearance of my skin? Thank you in advance for your assistance.