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Hide letters in MSG

Hello,

I want to hide the "typed in" message, how can i do this? I want to type in a password.
I show you my PRC:

4:CONTIN
~PW=
DSPMSG (NAM=PW_EINGABE, CHS=~PW)
IFTHENS (ST1=~PW, ST2=~PW_HN, TYP=EQ, LEN=6)
UNWIND (FRA=1, LAB=44)
ENDIF
IFTHENS (ST1=~PW, ST2=~PW_LS, TYP=EQ, LEN=6)
UNWIND (FRA=1, LAB=44)
ENDIF
!IFTHENS (ST1=~PW, ST2=~PW_FS, TYP=EQ, LEN=6)
! UNWIND (FRA=1, LAB=44)
!ENDIF
GOTO 4
44:CONTIN

Can somebody help me to solve the problem?

Thanks
Benji