I put:

root

it says:

BusyBox v1.10.2 (Debian 3:1.10.2.legal-losso30+0m5) built-in shell (ash)
Enter 'help' for a list of built in commands.

Nokia-N900-51-1:~#

i type:

Nokia-N900-51-1:~#chmod +x psfreedom-enable.sh

it says:

chmod: psfreedom-enable.sh: No such file or directory