UPGRADATION OF RAM IN EMPTY SLOT OF HI 10 AIR

in bios I saw another slot is empty for RAM. can I extend the ram on tht slot? or is tht possible for me to changet he RAM of existing slot to upgrade the same!
in . ! pls guide…

another issue is am using 128 gb mmc in tf slot… getting no problems with tht…if i continue using tht, will there be any problem in future!
pls guide me at ur earliest…