I want to report the loss (of)
我要办理挂失

讲解：
I want to report the loss (of)，of后面可以加任何东西，信用卡，银行卡，证件等等。
挂失 report the loss。
(I'd like to report the loss of my credit card and cancel it. 我要办理信用卡挂失并取消那张卡。)