This screen will actually be titled "Configuring: <the disk you choose>", but "hda" is a common example.
Here is an example of a common configuration session, accepting default input:
The default partition layout is /boot, /, swap, /home in that order. /home will be given what ever is left over after configuring the other 3 partitions Select the size of each partition in megabytes (autoconfigured defaults shown): /boot  > /  > swap  > /home  >
When the last entry (/home) is entered the installation will move on to the "Build New File System" screen.