Can you tell me how to fasten the seat belt? 可以告诉我怎么系安全带吗？

Can you tell me how to unfasten the seat belt? 可以告诉我怎么解开安全带吗？ 

Can you tell me how to .....(use the remote control)? 可以告诉我怎么...（使用安全带）吗？