Sometimes you need to click on GO two or more times for it to work properly. I just did yours to test it, first attempt failed, second attempt completed Successfully.
then after i pressed go and it says "SUCCESS" , what must i do next? which button must i press next? because till now my bios is still non-SLIC 2.1
That's it, it's done. There should now be a file in the same folder as the original BIOS with _SLIC added into the name. That is the new BIOS with SLIC 2.1, you need rename that new BIOS file to 8 characters or less (e.g. SLICBIOS.BIN) and flash it from DOS.