To add your partner to the app, head to your Me page (More page in Android) and tap '+ Caregiver' in the upper right corner of the screen. Then, follow the instructions to link your accounts (you can even send a text message alert). As soon as you've submitted your partner's email address, your accounts are linked!
To login as a partner simply download the app and tap 'login'. Then, enter the same email address that your partner invited and create a password. You'll be all set!
Please note: when you connect with your partner, you are adding them to a baby profile. If you have more than one baby profile, you will need to add your partner to each baby individually. For this reason, if you already have a partner in Glow or Nurture, you will need to add them again.