@eclipseddream:
Hello!
If you've already installed our extension, you'll find the button right below the video or photo. Now simply click it and select the desired format to download the file.
If the button doesn't appear, you should reinstall the extension. If that doesn't help, we'll be happy to help you resolve this issue by contacting our customer support team (uniloader.pro/contact-us).
Best regards, YouTube Downloader (UDL Helper) team!