Saving queries allows you to easily find them later, and share them with your teammates. Arctype also allows you to organize your queries into folders.
To simultaneously name and save a query, click on
Untitled Query above the query editor, change the name, and hit 'Enter'.
To save your changes, you can then click the save button in the menu on top of the SQL Client menu, or use the shortcut key
⌘ + S.