The Help menu is located in the top-right corner of the Panda Cloud home page. If you click it you will also be able to view the end-user license agreement.
This is the same agreement that you had to accept on entering your Login Email and password in the Panda Cloud login screen. The license agreement contains the terms and conditions that govern your access to and use of the Panda Security services.
Remember that you will only be asked to accept the end-user license agreement once, after logging in to the service, unless there are changes to its content, in which case you will be asked to accept it again.