On an Android phone:
- Open the Settings app
- Select Apps and notifications
- In the upper corner, select the magnifying glass
- Search for Upside
- Tap on the Upside app icon
- Tap Permissions
- Tap Contacts
- Tap Allow or Deny
- Close Settings
On an iOS device:
- Open the Settings app
- Select Privacy
- Select Contacts
- Select Upside
- Adjust slider to turn contact permissions on or off