Here are some of the questions you asked Nielsen Audio Customer Service about research reports.
Start with the Age/Gender Composition report and set the base demo for your market to 21+. Adjust the age cells as necessary and select the estimates you prefer. Both the Average Composition and Weekly Cume Composition estimates show percentages.
Find more information... Age/Gender Composition report
Look for the 
control in the upper right corner of the report and select the number you want.
Find step-by-step instructions... Display top stations
Click the Stations link at the top of the report to open the Select Stations dialog. The link may also read "In the Book" or "All Stations." Look for the Select Stations to Highlight link below the box of Selected stations. You can highlight one or more stations.
Find step-by-step instructions... Highlight stations in reports
You can select the geography to include by county or zip code. The link in the parameters section at the top of the window usually reads "Metro" or "Custom Geo Used." In the Select Geography dialog, open the Zip Codes tab and select two or more zip codes for the report. The report's detailed sourcing page (the last page) will list the zip codes selected for the Ranker.
Find step-by-step instructions... Build custom geographies
When you choose stations for reports, you can also choose to include a column that shows each station's format. This option remains the default for all reports until you clear the selection. Click the Stations link in the parameters section at the top of the report. The link may also read "In the Book" or "All Stations." Look for the Include Station Details link below the Available and Selected boxes.
Find step-by-step instructions... Add stations
When you set up the Ethnic Composition report, you can select all the Ethnic Categories available in the parameters. If you choose estimates like Average Persons, Weekly Cume Persons, and Average Composition, you'll see values and percentages for each ethnic group measured in the market.
The market you select determines which ethnic groups are measured. All ethnic groups are not measured in all markets.
Find step-by-step instructions... Ethnic Composition
When you select parameters for the County Composition report, choose all counties for Counties to Display and limit the Stations parameter to just the one you want.
Find step-by-step instructions... County Composition report