How to ZIP files --- Windows: navigate to the folder containing your files in My Computer or My Documents right-click the empty white space, and choose: New -> Compressed (zipped) folder give the ZIP a name now drag the mouse over your homework files to select them, and drag the group of files onto the ZIP file and drop them there. This will copy them into the ZIP. You can check that it worked by double- clicking the ZIP to look inside it. you can now turn in this ZIP file to the Catalyst turnin system. Mac: navigate to the folder containing your files in Finder select the relevant file(s), and right-click (Ctrl-click) them, and choose "Create archive of"