OpenCart

Go to your OpenCart administration panel, usually yoursite.com/admin. After logging in, go to: Design -> Theme Editor -> common.

Next, select the header.twig file in the menu that will show up. A code will appear on the right side of the screen. Paste the PlaySee installation code above the closing </head> tag and press Save.

That's all! Now that PlaySee widget is installed on your website, it's time to start working.