How use backup, if needed

Brand new user. Great program! Terrific forum! Elementary question: In issues, I know that I will be asked if I want to back up changes made to the Registry. I see that I can choose where to place the backup. But (in the unlikely event I have a problem), how do I use the backup to restore the Registry to how it was? Thanks.

Double click the file, it will say it will merge all of the items into the registry. You click yes and things return to how they were before you fixed the issues.

Double click the file, it will say it will merge all of the items into the registry. You click yes and things return to how they were before you fixed the issues.

Wow! That was fast--and helpful. Thank you, Lunarian.

If you want to view what's in the file, right-click on it and click Edit.