Frosting is delicious, but straight out of the can, it's tough, and tough to spread. Just pop it in the microwave in quick bursts until it's soft enough to spread out.
Toss the frosting into a microwave safe bowl and heat it on high for 10-second intervals until it is smooth enough to work with, however you plan to work with it. A few times will give you the consistency you need to frost cake, while a few more will get it melty enough to coat cake pops by quickly dipping them, or swirl two colours of frosting over brownies or a sheet cake.
Life-Changing Microwave Canned Frosting Hack [Better Homes and Gardens]