Please could anyone tell me what is the best way how could I change colors in CSS via SMOF option panel?
Thx for your time
do you mean the colours of the SMOF panel or the main website?
SMOF has an inbuilt stylesheet changer, just add new styles to the layouts folder, and they should appear in the stylesheet dropdown in the smof panel.
Then just add the smof code to the header.php to call the new stylesheet