My changes don't show on my site

Usually the site needs publishing again, or the browser shows an old copy.

Publish. Changes in the builder are a draft until you press Publish at the top right of the builder.
Reload. Your browser may show an older copy. Reload the page, or open it in a private window.
The right page and site? Check the address, and that you edited the site you're looking at (My sites).
Blog posts are published separately, under Blog (see Blog posts).
Your own domain just connected? Give it a few minutes.