You need to peel off the backing obviously.
Cleaning the glue area of the tube well is imperative to a patch holding well, Sandpaper works MUCH better than the little metal scraper.
The "orange ring" patch is likely a REMA. The only kind I use on MY bikes anymore. They may cost more, but they simply work so much better. Especially if you use THEIR glue. (vulcanizing fluid)
See if your LBS has the REMA "tourist" kit. I think it has 5 patches, glue & sandpaper all in one.
That would give you the opportunity to "correctly" use a REMA patch.
Besides working very well, you can patch on a patch because of the feathered edge. Not something that usually works with cheap patches that are akin to gluing "bricks" on your tube.