i am going to show you how to delete apps from cloud from kindle fore, but before deleting anything remember one thing if you deleted something and want it back than you have to purchase it again.
here is the method.....
on "Your account" menu you will find "Your apps & Devices" it shows all your apps,
just select unwanted aps, on the right side of apps there is a button name "ACTION"
from its pop up select "Delete this apps" and its DONE......
If you need any help further this feel free to ask