To determine a unique Id using a web interface, there is a need to:
A unique ID of a 1-Wire sensor looks like 2818 1d24 0900 00e8 (consists of four four-digit numbers in a hexadecimal number system: 0..9, a..f).
To connect a 1-Wire sensor, copy its unique Id from this page to a corresponding field on a page of a web interface.