You must have the appropriate permissions to view Roles and Permissions. Internal Chat (Conversations) must be enabled for your tenant in order to see these permissions.
For more information, see Roles.
Internal Chat (Conversations)
Launch Internal Chat (Conversations)
Controls whether users can launch Internal Chat (Conversations) 
from the app selector 
in NiCE CXone. Internal Chat (Conversations) allows NiCE CXone users to chat one-on-one and in groups.
Internal Chat (Conversations) requires a Digital Experience (DX) license. Users must have the Digital Engagement employee profile attribute to use Internal Chat (Conversations).
To allow agents to access Internal Chat (Conversations) in NiCE CXone Agent Workspace (Agent) applications, enable it for the desktop profile for their role.