confused how to add roles within Service Desk Plus

confused how to add roles within Service Desk Plus

Hello
I'm confused as to how roles are assigned within Service Desk Plus.

I have created a test role under Roles but this does not appear under assign roles options within user admin. 

Instead I just see Organization Roles.
I want to be able to create a group of techs to just see certain ticket types.

Can anybody point me in the right direction plse as it's driving me mad. 

                  New to ADSelfService Plus?