Side Panel On Center Console, Front:

Release screw (1) on left/right.

Slide panel (2) on left/right in direction of arrow and remove.

Fig 1: View Of Side Panel On Center Console (Front)

Courtesy of BMW OF NORTH AMERICA, INC.

Installation: 

Retainers (1) must be correctly seated in panel guides (2).

Fig 2: Identifying Retainers In Panel Guides

Courtesy of BMW OF NORTH AMERICA, INC.