Where can I insert the external SD Card in Samsung Galaxy S6 Edge(SM-G925I)?

The Samsung Galaxy S6 Edge is equipped with internal memory. As part of the design and concept of the Galaxy S6 device, there is no provision to insert an external SD card. If you want to transfer data from your old Galaxy device to new Galaxy S6, you can easily transfer your existing data including within a SD card to Galaxy S6's internal memory by using Smart Switch Mobile.  

While using the Galaxy S6, if you want to create room on your device, please back up transferable files such as “Photos” to a PC using “Connected as a media device (MTP)" mode or using "Samsung Smart Switch PC” program (*available from www.samsung.com/smartswitch). Additionally, we recommend you back up your data periodically by using a Samsung Account or Google Account.