I'm using Organic Groups to make groups, and have made two content types to be added to the groups. I'm also using the OG extras module, so now I have the 'Node content links' block, where users may add content to the group. I want some of the users to see one of the links to create one content type, and the other users to see the other link to create the other content type.
How am I able to do this? Do I need to use organic group roles? If so, I'm unable to find out where I set this type of role for a member. I know where I can create them, but not assign them.