Open the bonnet, identify where the brake fluid reservoir is and tell me how you would check that you have a safe level of hydraulic brake fluid.
Identify reservoir, check level against high/low markings.
Open the bonnet
Find and identify the brake fluid reservoir.
Check the fluid level is between the minimum and maximum markers.
Your should check your brake fluid level every month, if is below the minimum marker, or you think the car is losing fluid, you should take your car to a garage immediately.
The brakes are a sealed unit and you should never lose fluid unless there is a problem.
You should never attempt to refill your brake fluid yourself.