Final answer:
To allow pop-ups on a Mac, use Safari or Chrome settings to enable pop-ups for specific websites or all sites by adjusting preferences in the Websites tab or Privacy and Security settings, respectively.
Step-by-step explanation:
To allow pop-ups on a Mac, you can follow these steps based on the browser you are using. For Safari, go to Safari > Preferences, then select the Websites tab and click Pop-up Windows. Here, you can choose to allow pop-ups for specific websites or for all sites by configuring the drop-down menu next to 'When visiting other websites'. If you are using Chrome, click the Chrome menu > Settings, scroll down to Privacy and Security, click on Site Settings, and then scroll down to Pop-ups and redirects. Here, you can toggle the setting to allow pop-ups.