BuddyPress.org

php.ini is a global conf file for php. If you are running your own server you need to locate the file and open in a text editor and find the right line and adjust from 32 to 64. If you are on a shared host then you might get away with adding a line to the .htaccess file – that should be in your root directory – like thus:
php_value memory_limit 64M

This though will only work if a shared host has allowed this particular directive to be set, and I would have thought they wouldn’t but it’s worth a shot!