is it possible to add value to the attributes of in ADSIedit?

I had been using PowerShell version 3 and use LDAP query to query out both attributes and value from Active Directory. 

Is it possible to use powershell script to set value to the description attributes which had been written as <not set> in ADSIedit?

Or I need to change the the ADSIedit <not set> value before I am able to add value to <not set> description attributes?