Use the Joomla component installer to install the component file.
Joomla component installer
Browse for the jReviews component file in your computer and click the button.
jReviews component installation
When done both the jReviews component and jReviews comment mambot should be installed. Go to COMPONENTS >> JREVIEWS to check the component installation.
jReviews component installation check
Then go to MAMBOTS >> SITE MAMBOTS and look for the "jreviews comment plugin" and make sure it is published.
jReviews mambot installation check
If you want jReviews to process images in content using the lightbox effect then this mambot needs to go before the MOSIMAGE mambot. If you are adding content from the backend and are using the tag to place the images then you need to leave the MOSIMAGE mambot before the jReviews one.