Run the application and click Download on top, you'll see the user interface as below.
Step 1: Browse video page
Type a link in the Address bar, and press Enter key to open the video page. The application also provides eight built-in bookmarks. Just click the Show bookmark button and choose the video site you want. Currently, the bookmarks can’t be changed or added. The Go to previous page and Go to next page option only works for 10 pages.
Step 2: Download online video
Find the video you want to download. When the Download
button appears at the top right corner of the video, choose the resolution that you want to download and the video will be added to the Download queue in Media browser. Alternatively, drag and drop the URL to the Download pane to start downloading.
For more options, right click the file and you'll see these options: Open Source Page, Reveal in Finder, Delete, Pause, Resume, Clear finished.
Tip: To change the folder your video files are downloaded to, the number of simultaneously downloading video and uninstall extension, go to Product name > Preferences on the top menu bar, and switch to Download tab to make changes.