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Click the Configuration button in the top right of the page, and then the +Create button 
button at the top right of the table to create a new Provider.
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First lets edit the match script by changing tabs. I am simply going to return true here to allow any message through (we will update this later on but right now we just want the message to get through). Click Click Save.
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Creating a BuildProject Function
Now that we have our Provider, navigate back to the Webhook Configuration screen. You should now see your GitHub Provider row in the table. Click Create Function in the row's context menu or click the button at the top right of the table to create a Function for the GitHub Provider.
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