Apache permission denied. Help, no solution found.

When I follow the guide to get around the space limit I get an error.
I use that Putty application since I dont have terminal, I'm on a PC.

I get this:

"mv: /bin/: Permission denied
mv: /bin/: terminated with 1 (non-zero- statuts : Cross-device link"

when I type in:

"mv /Applications /private/var/Applications"

How can I fix this?
I've read somewhere that I need to CHMOD some files, but when I do that with PUTTY it says "file not found"
Help.

 

Any help is appriciated.