Smocked bishop buying dress with sweater

This sweet little smocked dress and buying sweater combo was recently smocked and knit by me. The bishop dress has a geometric design on the front and the back. Hand sewn buttonholes with genuine pearl buttons. The sweater is a soft cotton yarn, and the dress is fine lawn from England. Dress is machine washable, gentle. Sweater is hand wash, dry flat. Smocked dresses always look the best when ironed. Anyone know what an iron is, or how to use one? Definitely, do not put it on the high setting! Dress and sweater are a size 4. $120 for the set