In order to access Settings for any blog the person adding users to blogs, would need to have access to the blog (admin rights to it). Also to be able to add an entire roster,  that same user that has the Admin Rights also has to own the group that they are trying to give access to.
  1. Log in and got to Faculty / Resource Board
  2. Find the Portal Tile and under Portals dropdown click on correct Portal, here you will see a list of WordPress Blogs
  3. Click on Settings under the Blog you are looking to provide access to
  4. Add Users from Group Roster
  5. Click on the type of Group you are looking to add access to
  6. Select the School Year in the dropdown
  7. Click Search
  8. From here you will get the option to add all Members and Parents of Members
  9. Save