Before anything else, place your cake in a wire rack over a baking sheet. Because of this, you can catch the leftover frosting and scoop it up, and re-use it if needed.
Afterward, open the can of frosting, pour all the frosting in the container into a mixing bowl. Then, heat in the microwave for thirty seconds. Because of that, be sure that the frosting liquifies enough so that you can pour it over the cake. After that, allow it to cool down for a minute. For this reason, make sure it is still in liquid form.
Next, add two drops of gel food coloring to the mixing bowl. Then, fold in the desired color. Because of this, mix thoroughly until fully incorporated.
Afterward, carefully pour frosting over the cake in a circular motion until the cake looks covered. For this reason, ensure to use only about 1/4 of the frosting. After that, allow it to settle for about 10 minutes.
Then, scoop out the excess icing from the baking sheet and add it to the remaining 1/4 on the bowl. After that, pop it back into the microwave for about 10 seconds. Allow to cool down for 1 minute and pour it over again on the cake as the second coating. If you prefer a thicker frosting, repeat the steps to add more layers to the cake.
When the cake is all settled, please remove it from the cooling rack. Then, add decorations or toppings to finish up, refrigerate, then serve and enjoy!