Guide to Adding & Connecting a Second Parent

Okay, the steps I took:
New Parent:

  1. Create an account at https://my.scouting.org/

Current Parent:

  1. Navigate to Scoutbook Plus at: https://advancements.scouting.org/
  2. Select ‘Profile’ on the Navigation Bar on the left.
  3. Select child from the “Parents / Guardians For” list.
  4. Under “Relationships” on the left, select the Plus icon, opening the “Parent/Guardian Invitation” pop-up box.
  5. Select the middle tab “Search Scouting ID“, Enter: First Name, Last Name, Date of Birth, and Zip Code.
  6. Select the matching record from the below drop down.
  7. Select relationship.
  8. Click Save.

I think this does it.