[keycloak-user] Not able to add roles

Hi team, I have a user with roles of view realm, manage users and manage authorization. I logged in with the above user credentials and tried to access admin console, there I could to navigate to roles section, could see the roles and edit too, BUT cannot ADD new roles,v as well as cannot add attributes to the existing roles. Can some one from team guide me to provide which client role to this logged in user, such that I can enable ADD roles button and add attributes to the existing roles. Thanks Kapil