You need to ensure that the users already exist in smartadmin.

1. Create and populate your csv with these headers:
   username and Password. You can add as many groups as you need.
   e.g.
   Username,Password
   user1,cakezebraboat21
   user2,sharpmousefield56

2. Navigate to the 'Import' section of smartadmin here and select 'Password Import' in the Left Hand Menu
   
   

3. You are now ready to import your csv
   
   

4. Hit the 'Upload Your Password CSV' Button and browse for your csv
   
   

5. You'll see a Preview of the import data to check before hitting the 'Start Password Import' Button.
   After starting the import you'll see the Password Updated status gets a green tick
   
   

csv has now been uploaded and the users Passwords updated.