Facebook allows one Facebook pixel per ad account.
To create a Facebook pixel:
Start by clicking here: Facebook Ads Manager
If you have not created a pixel code, you will see this screen: click Create a Pixel
Step 1: Click Copy and Paste the Code
This brings up the install pixel screen. Click next until you see the blue Email Instructions button. Then click it.
You will then see a screen that allows you to email the code to yourself.
Copy your Facebook Tracking Pixel ID
Add your Facebook Pixel Tracking ID to your Folio:
Open the Folio to which you wish to add your code from your Folios list (select edit)
Paste the code in SEO section of the Settings Panel.