Occassionally you may need to rebuild your kernel with a driver which isn't part of the kernel source you have. This is a general guideline to the steps you will need to carry out.
Specific details are dependent on the type of driver.
Mention is made of editing various files and inserting extra lines. The position of these lines will depend on the driver. Normally a driver will come with instructions on the exact lines to enter and where. If it doesn't , you will need to experiment, position the entries near entries for similiar drivers. You will need to adapt these guidelines to the type of driver you have.