How to redirect http to https with valid SSL-certificate

Hi,

I’m completely new here; I hope this is te right place for posting my questing. First: thanks for this great Pro-version I bought last Friday.

My question: see the topic title. Those redirects I made with

RewriteEngine On
RewriteCond %{HTTPS} !=on
RewriteRule ^(.*)$ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]

in the .httaccess file. I experienced a lot with it in BP Pro, but noting was successful. And I do have problems with understanding English. Would you be so kind to explain it to me step by step, please?

Thanks in advance,

Ruud