• During registration you should specify company name.

    register user
  • Promo code is assosiated with your company.
    To get promo code, goto user's profile:

    user profile
  • After click on Manage your company:
    manage your company
  • Here you can see your promo code:
    manage your company
    Copy this code and send it to your colleagues. During registration they have to provide promo code during registration (see step 1)