Follow these steps to look up your tracking ID:
(1) Log in to your Google Analytics account.
(2) Select the “Admin” tab.
(3) Select an account from the dropdown in the “ACCOUNT” column.
(4) Select a property from the dropdown in the “PROPERTY” column.
(5) Under “PROPERTY,” click “Tracking Info > Tracking Code.”
Your tracking ID should be in this format: UA-000000-01. If you need more help finding this information, check out these pointers from Google.