You cannot call the API directly from a web page, or without authentication. You’d need to build something on the server side to fetch your Tweet. If you’re not experienced with coding then you might find that tricky. You can refer to the authentication documentation here, but I’d recommend checking for a code library that would help you so that you don’t have to build this yourself.
I’d suggest using the publish.twitter.com widgets instead, as they are easier to use. There are some customisation options you can choose from - for example if you just want to display a single Tweet from your timeline, you can use the data-tweet-limit parameter to only show 1 (the most recent) Tweet.
