Here is a small crapy tut
Open Le Fluffie then go here
It should look like this
Then right click the "File" box to add what ever the files u need, repeat ile step for folders and add files again/ change the "None" to "GameDemo" for demo duu, For title Make a 8 letter/number ID like "4DCD1471", Then put a Display ID in the box like here.
Hit the button
Then add a description, the on the pics right click them to add a pics /"Note they must be 64x64 PNG files"/ then select them.
Then after you select the png/description hit the save button again to save the title and description.
Leave this blank
select Dev Live, Then Create Package with a Name of 16 lenth like "4DCD147114711471"