This is the same tute I did with the text. It is in the tutorial section
viewtopic.php?f=10&t=2095It looks like this is where you went wrong. Right after the white layer mask, do this
"Click on top layer > edit > cut, click on the layer mask > edit > paste.
A floating selection will be created in your layer dialog. Click on the anchor floating layer item below, so now you have created a layer mask".
Check image in tutorial and it will show you how that stop looks.
Then save as: name.png to desktop or wherever you want it.
We would love to see your finished creation.....