You will first need to export your Keynote presentation as a PowerPoint presentation before you can use it in your SkyPrep platform.
To do this, simply click File, and choose PowerPoint under the Export To option.
Make sure that Require password to open is unchecked and hit Next....
Name your presentation, choose where you want it to be saved, then hit Export.
After that, you can upload the newly created PowerPoint presentation into your platform and use it in your courses!