Your story is the seed
A wedding invitation is harder than most because the couple rarely has one fact to give; they have a story and a whole day attached to it. Jitabi handles that by treating your description as the seed. Write the two names, the date, the ceremony venue, the reception venue, a sense of the scale, and anything about how the day should read, and it drafts a wedding page around that story rather than a form you have to fill cell by cell.
Weddings are one of the occasions with a dedicated design on My Joyfullday, so what comes back is not a generic announcement — it carries the sections a wedding page needs, in the order guests expect them, with the story up front. Everything is yours to change by replying.