Google Analytics Addon And Remarketing Code

I have the Google Analytics Addon installed and working OK but now want to enable remarketing lists to support display advertising and list creation

Google says I need to modify the code that goes on each page(shown below) but how or where do I make this change if the addon is adding this code to each page.

To implement Display Advertising features for Universal Analytics, insert the bold line into your existing tracking code between the 'create' and 'send' commands, as seen in this example:

Pbaz, thank you. But similar topic already exists on this forum:

I have been searching the forum but obviously not well enough. Thank you for pointing me in the right direction, I have made this change now so hopefully it will work for me.