After you've selected your location in the search bar you can filter the listings by Contribution. 


1. Click on "Contribution" and you can manually type the contribution range or drag the bar to your desired amount.



2. Click "Apply" .




For mobile/tablet users:


1. Click on "Filters" 



2. Scroll down to "Contribution". Manually type the contribution range or drag the bar to your desired amount. Click "Show X boats" once done.



3.  Click the "Show boats" button to apply the filter.