Some methods people *try* (and which are strongly discouraged) include:
* Buckling the belt loosely: This often just delays the alarm or makes it intermittent. It doesn't solve the problem and is incredibly dangerous.
* Using aftermarket devices: These devices can interfere with the car's electrical system and airbags and are illegal in many jurisdictions.
* Tampering with the wiring: This is incredibly dangerous and could cause serious damage to your vehicle's electrical system. It could even affect the airbag deployment system, putting yourself and your passengers at serious risk.
The safest and only recommended approach is to simply buckle your seatbelt. The alarm is there to protect you and your passengers. Ignoring it is extremely risky.
If the seat belt alarm is malfunctioning (constantly going off even when buckled), you should take your vehicle to a qualified mechanic to diagnose and repair the underlying problem. This is far safer and more reliable than trying to disable the alarm yourself.