Add members to your pages
Go to Settings, Social Media Channels, Channel, Add members
Step 1: Access the Settings Panel
Step 2: Go to the Social Media Channels Tab --> Click on the page you want to add members to
Step 3: Click on "Add All" to give all members access or click the plus sign to add individual members
OBS: This gives Members access to Engage. To give access to Publish and Measure add it in the respective drop downs