In RepU, open your widget, choose light or dark and left or right, then click Copy next to the embed snippet.
In Dyad, open index.html in your project. Paste your code just before the closing </body> tag. You can also ask Dyad:Add this script to index.html, just before the closing </body> tag, so it loads on every page. Do not change anything else.
Push your project to GitHub and Vercel redeploys it for you. 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.
Check Vercel finished redeploying after your push. Vercel Hobby is for non-commercial sites, so business sites need a paid Vercel plan.