More footer widget collumns

Hello, how could I add more widget collumns to my footer? I have 2 and I would need 2 more.
Please tell where to put the code in detail, I have almost no idea in programming
site name http://www.sneasy.lt
footer.php code https://gist.github.com/anonymous/a08d09be63ea6041a5e63d4d2ead5f72
style.css code https://gist.github.com/anonymous/be8246e487b5cd3e7a2e84475c7b88a5
Thank you in advance,
Jacob