1. Tabs missing on timer?
2. Bypass switch is on the top right - turn anticlockwise to On position.
To bypass the timer:
3. Blue wire should be neutral (Connect to bottom of the Main Breaker neutral feed on the same side as the black wire on the top OR join to the black neutral wires entering the timer - preferably remove the timer all together)
4. Faded brown/greyish should be live (Connect to bottom of Pool Breaker)
General
5. Electrician should be used if you're not familiar or confident.
6. Do not run extension cords outdoors unless rated for outdoor use.