To import an H5P unit to a course, visit the course's dashboard, either as administrator or instructor, and from the course dashboard, click on the Add content button (1), and next click the Add unit (2) option
This will get you to the Add new unit page where you can add new content to your course. Provide a name for your Unit and then select the source of the unit to be a file (3). This give you the option to either select among your course's file or to upload a new file (4).
Select to upload a file and upload your .h5p file (which is actually your unit). eFrontPro is going to take care or the rest, by importing your H5P unit to the course. Click to save the unit and you are done. You have just imported your H5P unit.
To export an H5P unit of a course, visit the course's dashboard, either as administrator or instructor. Over there you shall view a list of all your course's units. Find the H5P unit you want to export and click to view that unit. Notice, that you should not click to edit that unit, rather than just view it. Once you click to view this unit you shall be presented with the unit's content's. Notice that on the top corner on your unit there is an Edit button, click on the caret next to that button (1).
Among the option that will appear you shall find the Export option (2). Click that option to export the H5P unit, which will prompt you to download the .h5p file of that unit.