To use the graphics XLS-Biplot produces, you will probably need to take it to some other software or environment.
The easier (and not very satisfactory) way to use the graphics under MS-Windows is simply Copy-and-Paste: Select the Biplot window and choose Copy from the Edit menu in the menu bar. Then go to some MS-Windows application (Word, Powerpoint, etc) and paste the graphics in.
Similarly, under UNIX there are a lot of windows grabbing utilities that allows you to grab the Biplot window and convert it to your preferred format (xwpick, xv, xfig, etc).
But this way you will get a bitmap graphics with low resolution (just the resolution of your screen). To have the graphic in a format suitable for publishing quality, you need to convert it to some vectorial format such as postscript, pdf or windows metafile formats (wmf and emf extensions). Postscript files are the standard for UNIX applications.
Many MS-Windows applications have the option to insert graphics from a file. This file can be a windows metafile like those produced by XLS-Biplot. For example, to insert your Biplot in a Word document, first save it in MS-Windows extended metafile format and then go to Microsoft Word and use the Insert Graphics... From file... item menu.
XLS-Biplot can produce graphics in these and other formats with the help of some auxiliary applications. Once you have the right applications correctly installed and XLS-Biplot properly configured (see the appendix A) you simply go to the Save... menu in the window toolbar and choose Export graphic.... You will get a dialog window like this:
Then you mark the format(s) you want to get, give a file name by clicking its button and typing the name, and decide whether you want the produced file to be opened after conversion (provided you have the appropriate helper application).
Note that under MS-Windows, when every conversion is started, a dialog will ask the user to click "OK" when the program doing the conversion has finished the task.
If you can not use some conversion, probably you need either to install some application, or use the "Configure helpers" button to inform XLS-Biplot where to find them. See the appendix A for more on this.
There is a table summarizing file formats, extensions and associated applications in appendix C.1.