If the accent is supposed to be on the first stem down eight note(s), highlight the note(s), go to Properties and click on Use stems for articulations.
!NoteWorthyComposerClip(2.0,Single)
|Clef|Type:Treble
|Key|Signature:Bb,Eb,Ab,Db,Gb
|Tempo|Tempo:90|Text:"Moderato, not too fast"|Pos:7
|TimeSig|Signature:4/4
|Chord|Dur:8th,Accent|Pos:-7,-5|Opts:Stem=Down,Beam=First,ArticulationsOnStem|Dur2:Whole|Pos2:-3
|Chord|Dur:8th|Pos:-7,-5|Opts:Stem=Down,Beam
|Chord|Dur:8th|Pos:-7,-5|Opts:Stem=Down,Beam
|Chord|Dur:8th|Pos:-7,-5|Opts:Stem=Down,Beam=End
|Chord|Dur:8th|Pos:-7,-5|Opts:Stem=Down,Beam=First
|Chord|Dur:8th|Pos:-7,-5|Opts:Stem=Down,Beam
|Chord|Dur:8th|Pos:-7,-5|Opts:Stem=Down,Beam
|Chord|Dur:8th|Pos:-7,-5|Opts:Stem=Down,Beam=End
!NoteWorthyComposerClip-End
If the whole note is supposed to be articulated, there is a problem. If you accent the note first and then try to enter the eight notes stem down, it blows away the articulation over the whole note. One work-around is to use the diminuendo hair pin preceded by a dynamic with visibility to never as shown below, or by inserting the accent as text using NWCV15 fonts A = >, however it will not play as articulated.
!NoteWorthyComposerClip(2.0,Single)
|Clef|Type:Treble
|Key|Signature:Bb,Eb,Ab,Db,Gb
|Tempo|Tempo:90|Text:"Moderato, not too fast"|Pos:7
|TimeSig|Signature:4/4
|Dynamic|Style:f|Pos:0|Visibility:Never
|Chord|Dur:8th|Pos:-7,-5|Opts:Stem=Down,Diminuendo,StemLength=6,Beam=First,ArticulationsOnStem|Dur2:Whole|Pos2:-3
|Chord|Dur:8th|Pos:-7,-5|Opts:Stem=Down,Beam
|Chord|Dur:8th|Pos:-7,-5|Opts:Stem=Down,Beam
|Chord|Dur:8th|Pos:-7,-5|Opts:Stem=Down,Beam=End
|Chord|Dur:8th|Pos:-7,-5|Opts:Stem=Down,Beam=First
|Chord|Dur:8th|Pos:-7,-5|Opts:Stem=Down,Beam
|Chord|Dur:8th|Pos:-7,-5|Opts:Stem=Down,Beam
|Chord|Dur:8th|Pos:-7,-5|Opts:Stem=Down,Beam=End
!NoteWorthyComposerClip-End
Hope this helps.