No no, it’s really no bother :) This should be a tutorial huh? I’ll put it under the cut.
Okay, so go to “Customize” and then, you should see a bunch of customizing stuff. scroll down

until you see

you should see a customization page.

then, open this in a new tab to get the actual code.

next, go back to the customization page and

Update the preview. Then, follow the instructions for customization that I already included within the code.
****READ ALL OF THE CODE CAREFULLY BEFORE COMING TO ME WITH CUSTOMIZATION QUESTIONS****