Assuming you're talking about the resources, I bet there is a permission called "React to resources". To find that, go to https://yoursite.com/admin.php?permissions/user-groups/
. Click on the user group you want to have access to it, then set the appropriate permission to "Yes".
Again, I'm just assuming here because I don't actually use the resource manager. I'm just betting that it's similar to how the media gallery is set up in how it works.
If you're talking about downloads and articles that come from a custom add-on, then you would need to talk to the add-on developer about that.