How to write extension attribute populated in AD to ARS?

I am new to Active Roles.  I have a task to write or populate AD attribute and its associated data to ARS (Active Roles). My quick research told me that I should import module of Active Role Management Shell however having trouble to load it due to no valid module file was found in any module directory.  Further investigation led me to https://support.oneidentity.com/active-roles/kb/4340743/how-to-load-the-active-roles-management-shell-in-a-powershell-session this article, but I ran into another stumbling block with No Snap-ins have been registered for Windows Powershell version for Add-PSSnapin cmdlet. I like to hear your advice/thought to verify or confirm I am in the right path to achieve the goal I described. I'd appreciate your advice on this. Thank you!