How do I unlock the Black & Decker power scissors

There is a slide switch on top

WBT Electric Scissors is widely used in families or various factories that need cutting 0-10MM(depend on materials) .
Portable Electric Scissors Features
1. It is convenient and portable, chargeable and electric plugged.
2. Low consumption and high energy efficient.
3. By adopting tungsten steel blade, it is in durable service.
4. With low noise, favorable heat emission, anti-fatigue, and strong continuous work capacity.
Cutting Range(depend on materials):
10mm : underwear ,cloth,textile ,knitwear,felt,blanket, curtain
7mm :five layer cardboard, 17 sheets of A4 paper,one sheet is 80g
5mm :leather ,carpet,plastic, fiberglas , rubber
Random Accessories
Fuselage
Cutter head A(sharp/short working life/cutting quickly for hard and thick)
Cutter head B(blunt/long working life/cutting slowly for soft and thin )
Battery
Plug battery
Power adapter
Charging stand
2.Specifications
Rated voltage of charger : 100-240V
Output power : 35W
Cutting capacity :0-10mm (depend on material)
Blade material :Tungsten steel
Charging Time :2hours
Place of Origin :Fujian China
Brand Name :WBT
Machine body weight :0.376KG
Application :Industry and Household
Operate: Two using types,with cord(can continuously work)and recharge battery