Changes that you make while in your website’s editing mode are generally saved automatically. This means you don’t have to save changes in an additional step.
If you want those changes to appear for visitors on your ‘live’ website, please click the button Publish in the top right corner. This has the advantage that you may continue working on your Dolphin website “unseen” as long as you don’t click that button.
Should you actually change something by accident, you can always undo previous steps.