Any time you try to save a file, you are working in some window that offers you a way to choose both what the file name will be, and where it should be stored. It always has little spaces with its suggested (default) ideas for these choices, but you can simply click on that space and enter your own choice.
Usually to choose where, you have ways to move around on your existing drive to different folders, PLUS you have a way to move to a different drive. Almost always these are as simple as clicking on a name or iconic symbol.
Since you appear not to know anything about where files are and how to name / store / read them, you should learn the basics of how the My Computer system works. Click on My Computer and try looking though the topics under Help. Or maybe get a simple book from a library that introduces how to use a Windows computer.