Customizing Collection Name & Appearance on OpenSea

Is there a way to change the name of a collection on OpenSea? When I created my first collection, I didn’t understand how the naming system worked. I started my collection as, “The Patternbase” but in OpenSea it displays as “The Patternbase V2” since there was already an existing Rarible Collection with the same name.

I would also like to be able to add an avatar & banner to the collection page on OpenSea. Is there a way to do this?