Select one by double-clicking and it will show up in the Convert List. Few users will find fault with the easy-to-master approach WiseCleaner’s Freemake Video Converter Gold Portable takes to converting all kinds of videos to play on all kinds of devices (like your phone) since streamlined really is better, not to mention quicker.
You can also drag your video to the Convert List, after which operation the default Device setting is Mobile.