Permission install Prestashop

I've trouble in install of Prestashop 1.3.7 in my web host, i yet send all files, and when I enter in install i got this message in red: "Allowed to create new files or folders" like i haven't permission. But in Ftp program i saw that i've.

I found one solution in this web site:

http://ffct.cc/prestashop-allowed-to-create-new-files-and-folders/

And after I followed steps, two operations aren't found:

chmod and getcwd.

Someone knows if thats very important for the sequence of install ?? O开发者_StackOverflow社区r I can ignore in php file like site explain and install ??

Who can help me ?

Thanks and sorry for my bad english.