Simply click on the National ID Section of the Department of Household Registration, Ministry of the Interior's official website (https://www.ris.gov.tw), then click on Loss of National ID Card Application and Cancellation of Application (Citizen Digital Certificate not required) and enter your personal details to apply for a loss of National ID Card.
In order to prevent unlawful parties from obtaining your National ID Card and canceling your loss of National ID Card application using the details on the card, when applying for a loss of National ID Card, it is imperative to designate a "predetermined password for cancellation of loss National ID Card application". When applying for cancellation of loss of National ID Card, simply enter the "predetermined password for cancellation of loss National ID Card application" to protect your rights.