A blank page means you have an error in your PHP somewhere. Typically this is caused when trying to insert any of the lines needed to run the module and on in removes or replaces code by accident. The new instructions are very unclear and are being re-written in my next release to go back to the previous way.

For the time being, I would revert your changes to the previous files, then start again following the instructions in the old version (just before the 1.5 upgrade version was uploaded.) You will need to register the pages with the 1.5 admin, but the instructions on what you need to do are more clear with the older install.

Let me know if that helps.