Create a Custom Activity create-a-custom-activity
Follow these steps to create a new custom activity.
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                  Go to the Admin area.   
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                  Click Marketo Custom Activities.   
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                  Click New Custom Activity.   
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                  Enter a name and optional Description, then click Next. The API Name auto-fills, but can be customized.   note caution CAUTION If you decide to change the API Name, make sure the name does not conflict with fields in other custom activities. 
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                  Define your Filter and Trigger and click Next.   
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                  Give your primary field a Name that summarizes what the custom activity is for. 