CHMOD error for seo4smf install

Hi all
I have installed SMF forum on the forums folder of my site.

I try to install seo4smf.
I uploaded the package.

When I click on "apply mod", I get this


FTP Information Required
Some of the files the package manager needs to modify are not writable. This needs to be changed by logging into FTP and using it to chmod or create the files and folders. Your FTP information may be temporarily cached for proper operation of the package manager.
FTP Server:    
Port:
Username:    
Password:    
Local path to SMF:    /vhosts/twip.org/httpdocs/forums


I enter my FTP info, and it says there is no forums forlder...
I don't understand what to do

Any help?

Thank you