Do you have a floppy drive and a Windows Me boot disk?
If so...configure the BIOS to boot first from the floppy and then from the CD drive.
Make sure both the floppy and CD are in your computer.
After booting...you should be at the command prompt. All you have to do is change the directory to the CD drive and then run setup.exe. This will begin the operating system installation...in a perfect world. Of course, you may get a warning that may tell you the OS is already installed and if you want to replace or repair it.
It's been a while since I've used 98 or Me, but the above should, at least, get you to the installation process of Me. Once Me is installed...you should be able to upgrade...barring any problems you may have after reading the previous link I have given you.
Please let me know if this works...or if you have any additional questions.
Good luck!