how can I edit the database type after release?
What do you mean by "type"?
You can't change the name of the database after its creation.
I don't know what he means by "type" either, but I'm not able to delete a collection after created, even if it was by mistake.
Deleting a collection is not supported (but we know it is requested).
If by 'Changing Type' you mean the filed type, try here:
Click on Manage Properties.
Thank you. Liran.
But please add a features of deleting a collection.