From App Launcher, Search and Select NPSP Settings and work through the settings.

The NPSP Settings includes many areas of configuration for your NPSP org. The following are critical places for setup important for Donor 360.

• Open People, Select Addresses
  • Verify Organizational Account Addresses Enabled box is checked
  • If unchecked, Click Edit, Tick Checkbox, Save
• Open Relationships, Select Affiliations
  • Verify Automatic Affiliation Management box is checked
  • If unchecked, Click Edit, Tick Checkbox, Save