cannot change ibm 300gl 6287 boot order

The link to your User's Manual is below. Changing the boot order is on page 36. Please note the sections before that explaining that you can not change preferences in the BIOS without providing the Administrator Password. Entering the User Password will only give you a display of the settings, but not the ability to change them. In fact, you might want to READ the whole manual.

ftp://ftp.software.ibm.com/pc/pccbbs/commercial_desktop/p01k4690.pdf