First, navigate to the Collection you would like to change aspects of.
If you would like to change the Collection's name, click "Edit Collection". Here you can change the Collection's name, icon, folder, and description.
You can also add Sources to your Collection, connect integrations (or Powerups) to your Collection, and set an Abstract Limit by clicking manage next to Sources, Powerups, and Advanced.
If you need to create folders, delete Collections, or anything of that sort you would want to click "Manage All Collections" above the listing of your Collections. Here you can assign Collections to folders, move Collections between folders, delete your Collection, delete a folder, and assign team members to a Folder so they have access to the Collections within. Learn more about Folders here!