Does not show the if statements in any way?
 

import javax.swing.JOptionPane;
public class Main{





public static void main(String[] args) {
// declare your variables still
int salesTotal = 5;
double commissionRate = 10;
int salesClass = 10;

if (salesTotal < 10000) {
if (salesClass == 1)
commissionRate = 0.02;
}
else if (salesClass == 2) {
commissionRate = 0.025;
JOptionPane.showMessageDialog(null, "Commission is " + commissionRate+salesClass+salesTotal);
}

}
}
Will not show me the if statements. Is it the fact I forgot to put in the InputMethod?

Given the salesTotal and salesClass variables you have here, you have no branch to follow which results in any processing with the values provided. You do match salesTotal < 10000, but you do not match salesClass == 1. There is no else or elseif off of this branch, so no further action is taken and you exit the branch. There is no processing instructions beyond this point.

So how would I go about branching out?

I don't understand the question. You would use elseif and else clauses to continue evaluating a branch.

No, I mean, for it to compile, because when I compile, its like just compiling the main method. Nothing.

Yes, but you won't receive any output. You haven't specified a set of branch evaluations that actually lead to any useful processing or output, so it performs no tasks when run.
Look at your branch statements. You have this:
Look at where you are there. Since there is no satisfied condition it abandons the inner branch and returns to the outer branch. The outer branch provides no else, so it has no condition to satisfy and continues processing. There is no following instruction.

The only way you will ever get output in this is if salesClass is set to 2.