Seal N Send Besides Word Of Mouth Whats The Best Way To Tell My Guest About Being Registered Online For My Honymoon?

Besides word of mouth whats the best way to tell my guest about being registered online for my honymoon? - seal n send

I know its rude to print this information on the subject and I can not put registry information on an insert in the invitation because he is a seal and send No, I do not have a use for cover. What can I do? I have a record of donations to my honeymoon.