You do not say the specific problem that's causing you trouble.
On my oven when it get accidentally set into delayed timer mode I do this...
Switch the power off and on again so that the clock flashes
Then depress and hold in buttons 2 & 3 from the left
With the buttons depressed I set the time with the +/- buttons on the right - any time will do.
If this is nothing to do with your problem then post another question.
Good Luck..., August 2016