You can find your Google Analytics tracking ID as follows:
1. Log on to https://analytics.google.com/.
2. At the bottom left you will find the item Admin, click on it.
3. In the middle, you will find the item Tracking Info, click on it and then on Tracking Code.
4. You will now find your Tracking ID in the upper left corner, in the example it is UA-123456789-1.
If certain options are not visible, check if your Google Analytics user account has all permissions.