You need to write a whole essay for that? geez
First, you need to find the radius of the circular base. You can measure the widest part of the circle and then divide it by 2. Next, Calculate the area of the circular base. To do this, just use the formula for finding the area of a circle, A = πr2.
Now you need to measure the height of the cylinder. The height is the distance between the edges of the two bases.
Finally, you need to multiply the area of the base by the height.
Since you know the area and height of the base you can just multiply the two together to get the volume of the cylinder. Now you have your final answer.
I know this isn't an essay, but it's all by me and I hope it helps.