On 1 Sep 2020 David wrote on Adib_Samii-3: Hello Hadi Khan, I see by this profile that the person passed away in the 2,000's. We first create an account and our own profile and then add family and ancestors so if this is the profile for a deceased person you need to edit it to become your own profile and then add your family and ancestors. Then recreate the profile for the person this profile represents. [https://www.wikitree.com/wiki/Help:Membership See Help:Membership] and [https://www.wikitree.com/wiki/Help:Help_Index Help:Accounts] If you have any questions, feel free to ask! Thank you, David
Apparently you cannot undo a merge. You need to re-create the profile that was merged away.
See this G2g thread https://www.wikitree.com/g2g/831392/how-to-undo-a-merge