Shopify
Three routes, depending on whether the reviews already exist somewhere else, live in your store, or do not exist yet.
How to add reviews to WordPress
The exact steps for WordPress, in about five minutes, without a developer.
The short answer
Build a widget, copy one line of code, and paste it into a Custom HTML block. Appearance → Editor, or any page in the block editor. No developer and no theme files.
Step by step
Build the widget and connect your review sources
Choose a layout and match the colours to your site
Copy the embed code
In WordPress: Appearance → Editor, or any page in the block editor
Add a Custom HTML block and paste the code
Save and check the live page
Where to put them
A Custom HTML block inside a post or page, a sidebar widget area, or the footer for something site-wide. Page builders each have their own embed element.
Full-width sections suit carousel and grid layouts; narrow columns suit a badge.
Does WordPress have reviews built in?
No. WordPress has no built-in review system, so reviews come from an embed or a third-party tool.
If your reviews already live on Google or a marketplace, nothing built into a site builder will reach them.
If they do not appear
A caching plugin serving the old page, or a security plugin stripping the script. Clear the cache first, then check the plugin.
The WordPress troubleshooting page works through the rest in order.
Questions
Other setup guides
Any website
Whether your reviews already exist somewhere else, live in your store, or do not exist yet — three different answers.
Wix
The exact steps for Wix, in about five minutes, without a developer.
Squarespace
The exact steps for Squarespace, in about five minutes, without a developer.