When you press the "AmigaForever CD" button the AmiKit asks you to insert a CD. If the "Please enter volume..." requester still appears even after you inserted the correct CD, then it seems the WinUAE cannot recognize your CD-Drive. Anyway, there are two options how to fix the problem.
1. When AmiKit launcher appears, press "Configure Button" instead of the "Run AmiKit" button. The WinUAE configuration appears. Go to the "Misc" section and try running AmiKit with different "uaescsi.device" configuration, eg. AdaptecASPI, FrogASPI, etc.
2. If the first option fails, refer to the CD4 trick as mentioned in the FAQ
. Just make sure you enter exactly the same name as your real CD is named into the configuration box.
Another option is to use "AF Installed" button during the AmiKit installation. If your AmigaForever2008 is correctly installed the AmiKit should be able to find it. Note that it doesn't matter where you installed your AmigaForever2008 as long as the path information is located on the main system harddisk, for example you should be able to see AmigaForever2008 entry in Add&Remove programs of your Windows.