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Help with User roles

Hi,
i need some help with User roles. i have a Option Set defined as “Roles” with three different type of roles and when i sign up a user , i decide who is what.

i have a Home page with some links, one of the link takes you a form like this:

Mentor is the User with the Roles assigned

Currently , all the Mentors appearing in the listbox and all the Mentees also appearing

i want to display only the Mentor(logged in User) to display in the Mentor listbox and only the Mentee mapped with that Mentor when a user land on this page.

i would really appreciate some help here

Thanks