You have to go to „Community“ (in the bar on the top) – then to “Notebook” –
there you have “My notebook” – on the right site of your entry there is the symbol for the “trash can”

This is for the "old version" . The beta version I have not checked yet.

I hope this helps :)

Unfortunately, you can't :(

@Chikuse: You are welcome:)

btw: It is the same procedure on the beta version

You can delete your "notebook entry" and post it again.

For other entries there is no edit - delete - function

I hope italki adds this feature. Maybe not for notebooks? But for others, at least the first 5 minutes.