Timer to set battery to charge

Hi I’ve got the GivEnergy app on my phone but cannot find a way to preset a timer to take advantage of the 0 or -ve overnight prices. Don’t want to get up at 2am 😬 Please advise me how to do this

Have a look at Wonder Watt

Sorry, I don’t know what that is🤷‍♂️

Thanks- I’ve found it now!