In RepU, open your widget, choose light or dark and left or right, then click Copy next to the embed snippet.
Install the free Header and Footer Scripts module and turn it on. Then go to Configuration, Development, Header Footer Scripts, open the Footer Scripts tab, and paste your code.
Need more detail? See the official Header and Footer Scripts guide.
Click Save configuration and clear your caches, then open your live site to see your Google reviews.
Check your live site in a private window, not the editor or preview. A domain-locked widget only shows on your own domain.
Clear all caches after saving. The module does not allow HTML comments, so paste the script tag on its own.