Thank you for your tip. I have created a brief installation instruction to my profile page.
I have subitted my app again and reveived this :
* Issue/Request:
1. Your application requires an account to function yet has no way for account to connect with you application. The application only has a profile page stating that an account is needed.
This is not true : When you created an account and a record shop in episonic, you can use the widget. You can see that it works when you look at the profile of villalog (when you can see installed applicatios there) The application works as soon as you have created an account in episonic and created a shop. Episonic has 2000 members and many of them want to use their rmyspace page to sell their music. They can easily register their shop in episonic. I can not create a full record shop creation application in myspace. What does the last.fm application do ? You need your last fm account to have it on myspace. that is exactly what episonic does, so where is the problem ?
From "last.fm events" widget :
"Display your upcoming events from Last.fm on your profile. Just enter your Last.fm username and go! "
What is different in my page ? It is just the other way round, you need a user on www.episonic.com, set it up and then go !