The bookmarks bar is located below the address bar. By the way, Safari & Chrome users can press CMD+Shift+B to display it.
Continue & try it out1
Create a new bookmark and give it a name, i.e. Save to Ettúi.2
Copy the javascript snippet below using 'Select All' or something similar.
javascript:(function() {
document.body.appendChild(document.createElement('script')).src='https://notedapp.herokuapp.com/bookmarklet.js';
current_user_token = 'c19700618cab9906d37c1f4ff1';
})();
3
Now choose to Edit the bookmark you just created and paste the javascript snippet.