When you log in to your EndNote Online account you will see a Getting Started Guide.

Click on Hide Getting Started Guide / Show Getting Started Guidein the right corner to remove or find the guide.

A short overview over the Top Menu in EndNote Online

My References: Gives you an overview over all of your references.
Collect: Go her to add new references manually. Use New Reference to add a new reference manually Use Import References if you want to upload a RIS-file from your PC/MAC.
Organize: Go her to make groups and/or share groups and find duplicates.
Options: Use this folder to change your password and other account information.
Dowloads: Her you will find Cite While You Write that you need to add to your Word to be able to use EndNote in Word.

Top Menu in EndNote Online