Estatik Premium offers two types of import: Manual and Automatic. Manual import is the best one to start with. Thus you can make sure that all the fields are mapped properly. Once you checked that all is setup correctly, you can launch automatic import.
To import manually you need to click on Import and Select Manual. Then add filters if there are any required and press View Entities. You will get all MLS listings which are available according to your filters. Select and Import: