Simple: Thaw the chicken, rinse in the sink under cold water and trim off excess fat, rub with butter, apply a dry rub (even basic salt + pepper works fine), cut a couple lemons in half and plug them into the chicken, bake in 350 degree oven in a roasting pan for (20 min per pound approximately), remove from oven and allow to sit for about 10 min, carve and eat.
Another option would be to thaw the chicken, brine it (do a google search for "brining meat" or similar.....basically just soaking in mild salt solution for a while prior to cooking.....meat will be very tender and flavorful) and then roast it.