How to translate the whole site using Polylang

Hello,

I recently installed Polylang plug-in in order to translate my site from Croatian to English but I’m having some problems. I am only able to translate some general things on the site as well as widget titles. For all other parts of the site I didn’t manage to find where and how to translate them. This is the site developement-solutions.com and you’ll see what I can’t translate if you switch to english version. Please help