Steps to manage 

 1. Open the app > click Settings > Third party integration > click gear icon of Omnisend

 2. Enter the API generated on the step 1 to API KEY field

 3. In Integrate sections, select a list from Omnisend to connect data

 4.  Fill in the inputs with the Omnisend field tag (If additional fields are required, a value must be selected for that field)

 5. Click Save