Hi @sanjay, in that case, you need to do a search i. e Do a search for Role (constraint: name = Guest)'s first item.
A better way however, is to not create a data type called Role. Instead, create an option set called Role and add the different roles to it. You should then be able to do what I did in my screenshot. If you haven’t used them before, you can find information on option sets here in the forum.