Plugin / Hook not working?

[Alan1]

Hi,

I am not sure if this is the right forum -

I have activated the plugin/hook system on my bulletin board and have added a new plugin which hooks at the location - sendmessage_start.

In the plugin php code I have entered something very simple echo 'hello world';

Now when I go back to my forum and click on the contact us, in theory the words hello world should be at the top but instead I get a blank page??

If I turn off the plugin, the page displays like normal. If I replace the echo code with phpinfo(); then it displays the usual phpinfo information and then below it the contact us form.

So why is it not working for something simple like an echo command, did I forget to activate soomething else?