how do I open the sim card slot
how do I get the internet to work, when im away from wi fi
See Step 1:
http://www.etradesupply.com/blog/how-to-change-your-galaxy-s6-and-s6-edge-battery-in-5-steps/
There is a sim removal tool included with all new Galaxy S6's/edge's. You can use that tool to open pop open the sim cover.
With the edge the opening for this is on the top whereas with the s6 it's on the side.