There are two issues here
daryl.sr wrote:I contacted BlueHost's tech support and ask him to add the code in php.ini. He said its script issue, he doesn't know what code to a
The "tech guy" sounds pretty useless to be as there is a php.ini variable that needs setting. You may have the ability to change it yourself vis your Control Panel - some allow you to make changes and some don't. If you cannot change it yourself the contact BlueHost's support again but ask for level two - they should know what to do.
The second point is
daryl.sr wrote:basically won't allow any change to PHP.ini.
Now that is a different matter and may be their [current] policy - although I cannot see it as there are many boards hosted on BlueHost.