Assembly.

Very simple and takes just a few seconds for each badge.
First make sure your hands are clean of grease or make-up and that your working surface is clean too. This will ensure no fingermarks are left on your badges during assembly.
To assemble, peel a dome off its backing sheet and put into the recess in the badge blank. Try to avoid touching the sticky backing of the dome as this may harm its adhesion qualities.
Apply slight downward pressure on the dome to help the adhesion to bond. Depending on the badge type, you may need to take care to 'line up' the dome with the badge fitting.

If you are not happy with your initial alignment or want to make an adjustment, you can carefully prise the dome back out using a scalpel, knife or similar sharp flat instrument. Prise out and re-apply.