WARNING: This page is about a different car, the 2007 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.
Turn EVAP canister vent control valve counterclockwise.
Remove the EVAP canister vent control valve.
Always replace O-ring with a new one.
Fig 1: Identifying EVAP Canister Vent Control Valve Lock And Unlock Position