The Mercurial Revert Modifications dialog box enables you to revert your working copy to the state of a previous changeset.
You can access the Revert Modifications dialog by choosing Team > (Mercurial >) Revert from the main menu.
Choose from Revisions: Select a revision you want to revert to from the drop-down field. Revisions are displayed containing revision numbers and corresponding changeset IDs in parentheses. Revisions are listed according to date (i.e., the most current revision is displayed by default).
In the Options pane, select the Back up any Locally Modified files to <file>.orig option to prompt the IDE to store a temporary copy of your working copy version prior to reverting changes.