The WordPress dashboard is the administrative area used to create and maintain site content. What a logged-in user can see and change depends on the WordPress role assigned to that account. See Web site security.
Moving between the public site and dashboard
When logged in with a role that has dashboard access, use the WordPress Admin Bar at the top of the screen. Click the site name to move between the public site and the dashboard.
Dashboard navigation
The menu on the left side of the dashboard contains the content types and tools available to your account. The exact menu varies by role. Use the relevant Knowledge Base article for the type of content you are maintaining rather than relying on the + New menu as the primary workflow.
When finished editing, use Publish or Update as appropriate, then check the public page or record to confirm that the change displays correctly.