WKS, on the drive side lean down and you will see the square switch, plastic tab , pull it, this will open hood, and then find the lever in middle when standing at hood and push it forward to unlock.
Use Caltex Coolant 50% solution and 50% water
Technically there is no use of hi octane for vItz, you are just paying extra cost, hi octane, meant for performance engine, you are just wasting fuel
use youtube , you will many productive videos 