Yes Anael, soda is baking soda.
Mirabelle, a broiler is usually at the top of an electric oven. (Or it can be a separate part of a gas oven) You move the rack up as high as you can under the burner unit and turn the oven to broil. It gets the frosting mixture real hot and bubbly, then you take it out, but be careful not to burn it!
QuiltE, the cake is not heavy, but it is not light like an angel food cake. I like it because you don't have to get a mixer out, it turns out real nice just stirring the ingredients together. My aunt once told me to mix things with a pastry blender if you don't want to use a mixer, and I'll tell you, that works great!
Glad the BB got there Carrie! My son and his three little boys (age 7, 9 and 11) all shoot bow and arrows. The older boys were in a tournament in Sacramento a few weeks ago, and our son also shoots in tournaments.