Required: Check if your theme is Shopify 2.0 OS theme
If your theme is 2.0 OS theme, please install Ryviu widget codes for it by following these steps below:
Step 1: Enable the Ryviu Settings
From your Shopify admin, go to Online Store > Themes > click Customize button

Click on the App Embeds tab on the left Theme Settings panel.
Toggle the bar to enable the Ryviu app
Click Save

Step 2: Add section Ryviu Review Widget section

From your Shopify admin, go to Online Store > Themes.
Find the theme that you want to edit, and then click Customize.
From the drop-down menu, select Products > select a product template.
Click + Add section, and select Reviews Widget.
Optional: Click and drag the
⋮⋮
icon next to a section to rearrange the sections on your page.Click Save.

Tips: You can hide Ryviu Reviews Widget if your product does not have reviews by preselecting the option "Hide reviews widget when there are no reviews". Please make sure you click the Save button to apply the option for your product template.

Check this video on how to add it:
Step 3: Add Ryviu Star rating block
In Product information section
Click + Add block, and select Star Ratings. (If your theme does not allow add star rating block below your product title, please contact us so we can help you add it)
Optional: Click and drag the
⋮⋮
icon next to a section to rearrange the sections on your page.Click Save.

Tips: You can show star ratings if your product has no reviews. Please check the option ''Show star ratings when there are no reviews'' in the right menu. Please click on the Save button in the last step.

Check this video on how to add it:
Don't hesitate to contact us if you need more assistance!
All best wishes,
Ryviu team.