1. In Facebook Business Manager, set up your Pixel Code. Then “Copy and Paste the Code” in blue box.
2. Login your property website and choose Website Settings. Then find the portion with Title: Facebook Pixel Code and Paste the code you Copied in the first step into it.
3. Click "Save" button to complete.
4. Then, how to know whether the Pixel code is implemented well in your site? The easiest way is install the Google Chrome extension Facebook Pixel Helper.
Once it’s installed simply navigate to your website and click the extension icon. The drop down will give you the details of the Facebook Pixel and Events or Conversions that are working (or not) on that page.