Samsung SCX-5639FR-XAA - Manual (Page 246)

Storing email address
86 4. Special features
Searching with a particular first letter
1 Select (Scan) > Address Book > Search & Send > Select an
address group > ID on the control panel.
2 Enter the first few letters of the name you want.
3 Search upwards or downwards, and select the name and
address you want.