Looking all over the place for a single step-by-step intro to starting my first instance in the community cloud. I see a long list of custom images others have uploaded; if I try to upload my own (which is slow and tedious), I get:

Image: Only administrators can register kernel images.

If I try to run one of the existing images, I get:

ImageVerify: Failed check! Invalidating registration: xxx/yyy.manifest.xml

Nothing works and the documentation doesn't direct me to any obvious place to start. Help!