Please help me installing Elgg.

[xth_10580527]

Hello everyone, I'm trying to install Elgg but I'm facing two problems.
During Elgg installation Requirements check, I got two errors:

PHP
The open_basedir PHP directive may prevent Elgg from saving files to its data directory.

Web server
We think your server is running the Apache web server.
The rewrite test failed and the most likely cause is that AllowOverride is not set to All for Elgg's directory. This prevents Apache from processing the .htaccess file which contains the rewrite rules.
A less likely cause is Apache is configured with an alias for your Elgg directory and you need to set the RewriteBase in your .htaccess. There are further instructions in the .htaccess file in your Elgg directory.

For the second error I think it's about htacces file, I tried to change premestion to rewrite via FTPClient (Filezilla) but I got an error message:
550 Could not change perms on .htaccess: Operation not permitted

Please help me, thanks.

[glenn_admin]

Elgg can't be installed on the free plan because of specific server requirements which are not enabled on the free servers. Please consider the premium plan if you want to install Elgg:

http://www.xtreemhost.com/plans