You need to have the host install GD from php4 or php5. It comes bundle with php4+ and will take less than 1 minute to install by your host. This is a server side installation and can only be done by your host.

*IMPORTANT!*
You must solve this issue either using the bundle GD from php4+ or the free Imagemagik. Failure to do so will result in "thumbnail creation errors" across your entire forum. This has significant effect on user uploading Signatures, Avatar, Attachments... and even images that are posted in your threads. You must have either one installed, this is not an option.


Hope this helps. Good Luck!