To connect your RecallCue phone app and Day Clock simply log into both devices using the same account.
You only need to create an account once and it doesn't matter if you create it on the Day Clock or Connect phone mode then use the same username and password on the login screens of both the phone pp and Day Clock and your devices will be "connected".
If you have invited additional family members to your RecallCue account you must log into the Day Clock using the "owner" account. That would be the first account that signed up and invited the other family members.