When you've enabled LinkedIn Lead Gen Forms, you can use them as filters and triggers in your smart campaigns.
When people submit their information in a LinkedIn Lead Gen Form, that information is pushed to Marketo immediately, making the form available in the Lead Gen Form Name drop-down. Form names won't be visible until at least one person has submitted the form.
1. Use the Fills Out LinkedIn Lead Gen Form trigger to take action immediately or the Filled Out LinkedIn Lead Gen Form filter for scheduled batch campaigns or standard smart list filtering.
2. Add constraints to further confine your results.