Did you read the thread that Darrel linked you to? It even talks about the 18F2550 which is pretty much the same as the 4550... they do share the same data sheet.
__CONFIG _CONFIG1H, _FOSC_HSPLL_HS_1H & _FCMEN_OFF_1H & _IESO_OFF_1H
__CONFIG _CONFIG1H, _FOSC_INTOSC_HS_1H & _FCMEN_OFF_1H & _IESO_OFF_1H
As the thread said, this information can be found here
C:\Program Files (x86)\Microchip\MPASM Suite
From the same file.
; Configuration Bits
;
; NAME Address
; CONFIG1L 300000h
; CONFIG1H 300001h
; CONFIG2L 300002h
; CONFIG2H 300003h
; CONFIG3H 300005h
; CONFIG4L 300006h
; CONFIG5L 300008h
; CONFIG5H 300009h
; CONFIG6L 30000Ah
; CONFIG6H 30000Bh
; CONFIG7L 30000Ch
; CONFIG7H 30000Dh
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