How to change permissions of read-only file system

[postcd]

Code:
amnesia@amnesia:/lib/live/mount/rootfs/filesystem.squashfs/usr/lib/purple-2$ stat /lib/live/mount/rootfs/filesystem.squashfs/usr/lib/purple-2
File: `/lib/live/mount/rootfs/filesystem.squashfs/usr/lib/purple-2'
Size: 575 Blocks: 0 IO Block: 1024 directory
Device: 700h/1792d Inode: 2651 Links: 3
Access: (0755/drwxr-xr-x) Uid: ( 0/ root) Gid: ( 0/ root)
Access: 2013-12-09 22:28:24.000000000 +0000
Modify: 2013-12-09 22:28:24.000000000 +0000
Change: 2013-12-09 22:28:24.000000000 +0000
when i try to wget some file into this dir, it says:
Code:
Cannot write to “libskype.so” (Read-only file system).
part of df -h
Code:
/dev/sda1 2.5G 1.2G 1.4G 46% /lib/live/mount/medium
/dev/loop0 892M 892M 0 100% /lib/live/mount/rootfs/filesystem.squashfs
/dev/loop1 205M 205M 0 100% /lib/live/mount/rootfs/0.22.1.squashfs
tmpfs 1013M 0 1013M 0% /lib/live/mount/overlay
Can anyone please advice way to input some file into that directory?

i have amnesia and root rights too (and im noob)

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