need help on ROTH IRA

[guardianx]

well this is the story i'm 25 and i have a little money won from poker so i decide to stick it into the vanguard index fund.

When i tried to open the roth acc with my bank which is Citibank. The guy who talked to me say he doesnt have the right to buy vanguard index fun and he suggested me some other fun manage by the calamo...he gave me some chart that shows promising result but i'm like no thanx i have my heart set on the vangaurd index

now the question is how do i go about to get my roth ira set up and fund the 3k into vanguard index fund.