Hello, thank you for taking the time to post your question!
The underlying formula that you want to use here is
pH + pOH = 14
so since we’re given that the pOH here is 5.36, that makes the equation
pH + 5.36 = 14
pH = 14 – 5.36
pH = 8.64
I hope that helps get you moving in the right direction! Feel free to reach out if you have any additional questions beyond that :)