Sue,
I have two recipes for you to try. They are very good and not too difficult.
Quick Fudge Frosting
2 Squares(1 oz. each) semi-sweet chocolate
3 cups powdered sugar
1/4 cup butter or margarine
1/4 cup hot milk

Melt chocolate. Add sugar, butter and hot milk.
Remove from heat. Beat until smooth.
For a thicker frosting add more powdered sugar.
For smoother frosting:add a few drops of milk.

Chocolate Buttercream Frosting
1/2 cup butter or margarine
3 cups powdered sugar
1/4 cup evaporated milk(you can use plain milk)
1 tsp. vanilla
3 squares melted unsweetened chocolate
Cream butter. Add remaining ingredients.Cream until light and fluffy. Frosts two layers. I hope you like them. Nora