CHMOD 0777, but Wordpress still not able to write files/folders

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http://serverfault.com – The day before yesterday I ordered my own VPS. But now I have problems with Wordpress, Wordpress is not able to create a .htaccess by itself, not able to write to it and plugins aren't able to create files/folders. Support hadn't the time for me, so since yesterday I'm looking for a solution by myself, with no luck. If I change the CHMOD of all folders and files to 777 or 755, I still cannot write files/folders. So I looked further, the owner/group of my www folder on the vps is webapps:apache. I tried to change webapps to the user "root", "nobody", "apache" and "admin". But nothing worked. (HowTos)