Can't add to List in a website embedded List

Hi, I’m new to Listly.
I’m testing Listly and it looks like a great solution.

I have a problem to add an item to an embedded list in a website (
After clicking ‘Add to List’, I need to login to Listly. After that, the page returns again to the list view ant not to the add item option.

Can you help me with this?

Thanks in advance,