I\'ve got a brand new install of WordPress setup and activated a custom-built theme along with a good amount of plugins. In the posts, I have built it so the user can create a p
I'm guessing you have some type of Linux installed, probably Ubuntu or CentOS.
Ubuntu: sudo apt-get install php5-gd
CentOS: sudo yum install php-gd
You probably have to restart Apache afterwards: service httpd restart
or service apache2 restart
-- the names differ from distribution to distribution.
Let me know if this works!