To save a file, either click on the "Save" button or choose "File, Save." If your file has been saved in the past, this will just overwrite the old version. If your file has never been saved, you will be prompted for where you wish to save the file. The current directory is displayed at the top of the pop-up window. You can also use "File, Save As" to save the file with a different name, and "File, Save All" to save all open files.