Select that file. Select the level of compression that you want, if any, from the compression menu. If you compress the file, it will be smaller and will take less space on your hard drive. The files can be decompressed later when you want to open them. From the Password menu, add a password if you want one.
Passwords are optional.
Click on Add. You return to the WinZip window. The file you selected is displayed in the window. Once again click on Add. Select your second file and any other files you want to include.