On all pages, the menu bar should have a search icon on the far right. It is in fact there, and if you click on the white space in that area, the search function will activate. https://www.dropbox.com/s/ig73tde5cr9h3b6/Screenshot%202018-09-10%2010.02.48.png?dl=0
Also, on posts, there is a share section near the bottom that is also all white and only shows up when you hover over it. It should always be visible.