Read the guide more carefully:Originally Posted by anonOmus
4)Now you have to use the keyboard to move the cursor over the function or submenu you want and press Enter to select it.
Select the 4th option: Processor type and features
If you have a multiprocessor system you might want to enable "Symmetric multi-processing support" (SMP): select it with your keyboard and press the spacebar to enable it (a "*" will appear beside it). If you don't have it don't enable it.
Select Processor Family and choose the right one (i386 in my case) depending on the output of the command “uname -r” you have used before
Press the right arrow and select exit