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When the AAPC Confidence Intervals - Empirical Quantile option is selected for the session, the AAPCs cannot be computed after the Joinpoint calculations are performed. The Specify AAPC Ranges window will be unavailable in this case.
When the AAPC Confidence Intervals - Parametric option is selected for the session, the AAPCs can be computed after the Joinpoint calculations are performed, using the APCs. With this option, the AAPCs can be modified in the output without having to rerun the session. When viewing the Joinpoint output, to specify which ranges to display use the Options choice located in the Output window task bar. This will open a window. In that window, select the Statistics tab. On that tab, you will see a button labeled "Specify AAPC Ranges". When you click that button, you can select to display the AAPC for the entire range of data, the last N observations, or other specified ranges.