You'll get the hang of it, don't worry. The sudo command means that the next
command will be performed with super user powers. And you wish to mount, so
now what you need issudo mount /filesystem/you/wish/to/mount
/where/you/want/to/mount/it
(In the command you mentioned sudo gave the chown command super user powers.)
Note that Nautilus (the file browser) might auto-mount for you or include it
in the left hand filesystem list where you can right click > mount it, or
perhaps just left click. Then it will be mounted under /mnt
