Here is a suggestion
Take the section "Choosing a different background" and put it on a new page, I suggest calling it "Background Image" and put it in the section "Setting Up"
If you read over it again from time to time, you will think of ways to improve the wording.
Where it is now, people are not likely to find it. If it is in a page named appropriately, people will find it. It is suitable for a separate subject.
There is no page about background images in the wiki (It is not good to have two different pages saying the same thing).
When starting new pages, think carefully about what to name them. If you rename a page in the future, you can't delete the old page.