If you are trying to import your processes (or nodes) ...you MUST have your hierarchy set to "Advanced" to activate the import button. Otherwise...the ability to import is not available. When you are done importing, you can switch the hierarchy back to basic...if needed...see note below.
Important Note: In order to "Record" when the Hierarchy is set to "Advanced", the user must have "Admin" rights. Otherwise...you will get an error message indicating accordingly.