This page is part of the Workshop. It should be open to anyone.
Go to the workshop here.
http://www.rccombat.com/asp/workshop/workshop.asp
The Decals are in the top link on the left, "Detailing".
If you want to make a decal larger or smaller for your plane, right click the decal and click "Save As." Once it's saved to your hard drive you can open the decal in an image-editing program and print it at whatever size you want.