The wax seals are semi flexible and can be glued down using a hot glue gun. All you need is a little dot of glue to paste down. I recommend using a hot glue gun that can be purchased from a hardware store or craft store.
Purchase the purpose made Wax Seal stickers along with your wax seal purchase and simple peel and stick onto your invite or envelope.
If white is not your thing, I can also offer up to 27 other colours including metallics. Let me know what you have in mind. Or if you want a completely different pattern and you have seen it elsewhere let me know and I will make every effort to get it in for you.