The widget appears only when three things are all done — most "it's not showing" cases are a missing one:
Publish the widget in Homsie. In Marketplace, open the sign-up widget and click Publish. If it still says "Changes not deployed," it isn't live yet.
Add the embed code to your site. Click Copy embed code, then paste the snippet into your website's HTML, just before the closing </body> tag.
Publish your website. The widget shows on the published version of your site, not a draft or preview.
If you've done all three and it still isn't appearing, confirm the snippet is on the page you're viewing (and site-wide, if that's what you intended). See "Set up your sign-up widget."