open terminal

"root" press enter.

"umount /dev/mmcblk1p1" (unmount mmc's first partition.) press enter.

"parted" press enter.

"resize" (its going to ask what partition number?)
 put "1" then press enter.

Start? [32.3kB]? (that should be fine.) press enter.
End? [8166MB]? (here put what is good for your needs.) example 6000MB then press enter.

you've just resized your mmc.

"print free" (to see where to start new partition.) press enter.
 
"mkpartfs" press enter.

Partition type? primary/extended ("p" for primary or "e" extended  for should be good enough.) press enter.

File system type [ext2?] (it's fine for now so..) press enter.

Start? (now put where you would like it to start.) example 6032MB then press enter.
End?   (now put where you would like it to end.) example 8166MB then press enter.

"quit" press enter.