HIde images and some content from Guest users

Dear All,
I have a question, and i hope i am posting in the right place, if this topic belongs to another forum, please guide me where to post it.

the question is: i have a website created with WordPress and i am using the Jupiter theme, i need to hide some content (like hiding the last half of the article in a page) and disable the photos to be enlarged unless the visitor is a registered user, i need to know how to do that, and if there is a plugin to do that, i have tried “layered-popups-for-wordpress” and “optin-content-locker-layered-popups-addon” but they didn’t work properly.

Thank you very much