Embedding the community is not supported on Google Sites. Instead, you can link to your community by following the steps below.

1. Visit Google Sites.
2. Log in to your account.
3. Select your site.
4. Go to Pages.
5. Hover over the + (New Page) icon at the bottom right.
6. Click the New link icon.
7. For the Name field, you can enter any value (for example, Community).
8. Paste your community address into the link field.
9. Click Done.
10. Click Publish.
11. Navigate to your Google Sites website and you will see a new link in the navigation menu for your community. Click it to view your community.