The most common "uh-ohs," fastest fix first:
"My changes aren't on my live site." Page edits are a draft until you click Publish at the top right. If it says Published, try refreshing your live site.
"My site says not found." Check the address. The one at the top left of Studio is always right. If you connected your own domain today, it may still be settling (up to a few hours).
"My site is offline." If your free trial ended without a card, add one under Settings → Plan & billing. Everything comes back right away, nothing lost.
"My video isn't showing on the sermon page." Is the video public on YouTube or Vimeo? Private videos can't show. Fix it there and the page heals itself.
"Planning Center says it needs to reconnect." Not broken, access just expired. Settings → Planning Center → Sign in to Planning Center again.
"I changed something and don't like it." Use undo at the top (⌘Z / Ctrl+Z). If a page has gotten into a state you can't fix, Settings → Start over can reset the design and keep your content, and it can be undone afterward.
Anything else: email us with your church name and what you expected vs. what happened. Screenshots are gold.