Undo

This command allows you to reverse the last actions made. The first time you select this option, AceHTML will reverse the last action you performed. If you select this option again, AceHTML will reverse the action before that, and so forth.

• In the Edit menu, select Undo.
  or

• On the Edit toolbar, click on the Undo icon.

You can also use a shortcut by simultaneously pressing on the keys CTRL+Z (Refer to list of shortcuts).