Navigate to (C:) > Users > Your PC name > Dropbox folder and drag and drop the files you want to share in this directory. Next to your files a blue icon will appear which shows you that the files from your Dropbox are currently being updated. Wait several seconds until the icon turns green and after that, right-click on the files and select Share Dropbox link option. Click on the window that will appear in system tray and you will be redirected to your Dropbox account where will be a link with your files. Copy the link from your browser address and send it to your friend. Also, in Dropbox folder you will have a Getting Started file which will help you to get familiar with all Dropbox functions and features.