How do I pop-up MetaMask?

Excuse me, could you please clarify how one would go about popping up MetaMask? I understand it's a popular cryptocurrency wallet and browser extension, but I'm having trouble getting it to display on my screen. Are there specific steps I should follow to initiate the pop-up, or is there a setting I need to adjust within my browser or MetaMask itself? Any guidance you can provide would be greatly appreciated.