Hi,

Please do follow steps to do that:

1/ Make sure you've enabled plugin "Penci Reviews" - if not, let's install it via Appearance > Install Plugins

2/ Go to edit a post > scroll down and fill all the information for your review

3/ Copy shortcode:    [penci_review]   and embed it anywhere inside your posts - where you want to display the reviews.

You also can check more options for Penci Reviews via Customize > Reviews Options

Best Regards,

PenciDesign