Finding an entry in your materials catalogue is an example of locating by text entry.
Initially, the Enter … to locate field will contain the name of the entry that was highlighted in the list when you pressed the locator. To locate to another entry, just type the first few characters of the entry you wish to locate and press the OK button. The list will then select the first item whose name begins with whatever you typed. So, if you typed c, the list will select the first entry that begins with c.