Please have another look. To get help here, you really need to follow these instructions. If you don’t follow those instructions, we can’t guess what you might be doing wrong because we can’t tell what you’re doing or what you’re trying to do.
Since you follow different instructions you should try to get help from the guy who made the video, or the good folks at Digital Ocean who made the 1-click installer. (Last I knew, the person that the person responsible for maintaining those instructions no longer worked there, but that could have changed several times since then.)