I still don't understand it.
Will I put this in Notepad as .htaccess.txt and copy it to the server?

RewriteEngine On
RewriteCond% {HTTPS} off [OR]
RewriteCond% {HTTP_HOST} ^ sosd.sk [NC]
RewriteRule ^ (. *) $ Https://www.sosd.sk/$1 [R = 301, L]

Should it show up as a secure site right away?