Excel Workbooks are no longer accepted by the uploader - all uploads should be in .csv format; preferably .csv UTF-8
This is a video tutorial showing you how you can add your Learners to the dashboard using the File Upload method. If you prefer a written article, or would like to have it as a reference, you can find that here: How can I upload my Learners using file upload?
Here's the video - you can maximize it to full screen after you start the video by clicking the Full Screen icon at the bottom-right of the video or Click Here to open the video in a new tab.