[Newbies] Adding method to Smallinteger class

Hello, I literally just installed squeak about an hour ago. After looking at some tutorials and playing around I have a basic understanding of the environment. Im now trying to figure out how to add a method to the smallinteger class. I have found some examples but they are a little too complex for me to understand.....sorrry im being dumb...... the method I would like to add would be called larger and would return larger of receiver and parameter. Could someone please walk me through this step by step.

for example.

10 larger: 6 evaluates to 10

thanks for your help in advance.