
You may enter either or both of these options:
    I - Ignores case when doing search
    R - Reverse search; search toward start of file

You may use the keys to edit the options:    
    Enter - confirm entry and begin search
    HOME - go to beginning of entry
    END  - go to end of entry
    INS  - toggle insert mode
    DEL  - delete character under cursor
    Left arrow/right arrow - move cursor left and right
    Backarrow - delete character before cursor
    
    ESC - cancel and return to edit mode
