301 redirect from http to https

I have just installed a SSL certificate on my site. I changed my address from http to https inder the admin>general options, but now my PR does not exist. How do I set up a 301 redirect from http to https in my .htaccess file. I am not savy on this so please be nice. This is my .htaccess file now….

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

# END WordPress