I know it has been explained and it can be applied to other Mac models with no problem. But I happen to have the OS 9 for this model (it has two Eject applications) so let me add this.
1. Use the Control Strip.
-If it doesn't appear on your screen already, go to Control Panels > Control Strip to set it up.
-Go to go to Application (Mac OS 9) > Apple Extras > Eject Extras > Eject Extras folder
-Drag the Eject Strip onto the Control Strip. That's it, done.
-You can remove items from the strip by going to System Folder > Control Strip Modules folder and drag them out of the folder then restart.
-There is a good guide about it in Help Center (Help menu bar > Help Center and type "control strip" in the search box).
2. Use an F-key to open the tray.
- Go to Control Panel > Keyboard and click the Function Keys button.
-This will open the Hot Function Keys window.
-Now, go to Application (Mac OS 9) > Apple Extras > Eject Extras > Eject Extras folder and drag the item you want to use into a box such as the F12 in the Hot Function Keys window. Click OK.