The part surrounding the jacks is a thick sticker. The tip of a hobby knife is the easiest way to lift the sticker. However, it is very likely to cause small scratches in the surrounding area. A small piece of tape beneath the blade can help protect the paint somewhat.

Once there is enough room, insert a plastic tool like a spudger or guitar pick to prevent further damage.

Gently pry the sticker so that the 3.5mm jack end can be lifted.