Chosen Solution

I just used the guide to replace the display/screen on my iPhone 6s and now a yellow/orange spot is showing up on the top of the screen…how do I fix this? Is it going to cause problems if I just leave it alone?

That is caused by either the alignment of the earpiece speaker or the rectangle silver cover behind the display. Moving it up a bit with your hand and trying to fit the screen in again usually fixes it.