The review link settings tab deal mostly with call to action button links in your review entry, you can use it to include links to product pages or if you are an affiliate marketer then you can add an affiliate link (I recommend using the ThirstyAffiliate plugin). Also, there is a feature to add an extra button (for example a product demo page).
Links will be displayed in the Rating Box as a button to increase conversion.
Links are mostly external, means it link to a page outside of your site, so basically we add rel=”nofollow” attribute to those links. However in some cases you may need to dofollow a link, so we’ve added an option for that in the review link tab. Also, you have the option to set the button text.