Copy the value of the variable and paste it into the last text box.
Unless you are a one-man-band, you definitely do not do that alone.
Identifying such tracking codes especially in large GTM containers can be a fairly quick win to improve page speed.
I watched a YouTube video I how to set up my GTM.
I took those very same 8 tags FB Pixel, etc.
What do you think of Google Tag Manager? Enter the hex color code of any color into the Plugin Color field! Google Analytics is used for actual reporting and analysis.