MyListing 2.6.0 and newer versions have WP All Import support built-in. Once you activate WP All Import, you're ready to go.
For older versions of MyListing (pre v2.6.0), you can install the addon from the link below.
(Old) MyListing Add-On for WP all Import - Download
(This addon must be deleted if you update to MyListing v.2.6.0 or newer versions in the future)