We've pulled together some questions and answers that you might want to read before coming along.
Riverside Bar and Café is inside Dunelm House (aka Durham SU, the SU, the DSU). It’s the concrete building just up the hill from Elvet Riverside, or you can reach it from the Bailey across Kingsgate Bridge. The bar itself is on C Level. Just go through one of the main doors and keep going down the stairs until you see the bar to the right of the C Level staircase.