WARNING: This page is about a different car, the 2007 Kia Rio5, 2007 Kia Rio, 2006 Kia Rio5, and 2006 Kia Rio. However, it is still accessible from the selected car via links, so may be relevant.
Push the inside rear view mirror base (A) down to remove to inside rear view mirror assembly (B).
Installation is the reverse of removal.
Fig 1: Identifying Inside Rear View Mirror Base And Mirror Assembly