Perfect. 1.- In the file manager please click on the disk that says "128 GB Volume"
In GNU/Linux everything is a file. So instead of letters like C: or D: your drive should be called something like /sda1 /sdb /sdc /sdc1 it depends.
2.- I see Gparted is installed please go to the Applications look for it, muust be under menu settings or system, and open it.
