The easiest way is probably to find a plugin that allows you to restrict content to logged in users only via shortcodes and such. There are a few out there on wordpress.org, you can find one that suits your needs.
Another way would be to change the theme file, but that’s more complicated.
I managed to solve it already, I did it with CSS.
But sure it’s nothing secret then as it will still be visible to search engines and people that dig around in the source.
Hi @riquezz .. can you shared what you did it with CSS??
thank you before..