In order to find the devices you are logged into you would need to click the box of your google account located in the upper right corner of your gmail. Which either has your image or first initial of your name. Once you click the box you will next go into manage your google account. Once you are into your google account on the left region you will see " Home, personal info, data privacy, security, people & sharing and payments & subscriptions. " Next click into security and once your in security you will scroll down until you see "Your devices" on the left bottom corner. From that menu you can report a device lost or manage devices you are logged into.