finding the optimal portfolio for two risky assets

if you could show me how you did it in excel i would be forever grateful. thank you!

Ers) E(rB) OB OS 5 (pBS) 8 10 19 0.2 Portfolio Weights WS=1-WB WB -0.2 Expected Return: E(rp) Col A *A3 + Col B *B3 1.2 4 STD Dev (Equation 6.6) 9.59