Make two metanies (profound bows) with the Sign of the Cross preceding each bow. Kiss the Icon. Then make one more metany with the Sign of the Cross.
You bend your head to kiss them. If this is not possible, touch your hand to your mouth and then touch the Icon.
“We should kiss the feet or hand of Christ or, in the case of the popular icon “Not-made-by-hands” (Mandylion), the hair (never the face). Icons of the Theotokos and saints are reverenced on their hands.”
Depending on the parish, sketch #2 or #3 is what a metany looks like.
https://scontent-b-atl.xx.fbcdn.net/hphotos-prn2/1185012_192577914246882_1865912693_n.jpg