I want to install on my account alli.99k.org the internet shop engine, "simpla".
So I copied required files, and open the page http://alli.99k.org/install.php
But after accepting the user agreement terms, I recieved the message: "Can't create the folder, please, set access rights 0777 to folder /www/99k.org/a/l/l/alli/htdocs
So how should I cope with it? I can set temporarly access rights to any subfolder, not to the base folder, unfortunately.

you don't get to see the htdocs folder, however your starting directory is such, so just create a folder, lets say, shop and upload the simpla files/folders to this new folder and set the permission to 777. Keep in mind that your shop will now reside on http://alli.99k.org/shop If you don' want that then just set all the folders to 777