Alright let me give you an example of how to correctly use a skipflag
#0100
<SKJ0001:0101
<MSGHere is some dialogue
that you only want
to display once.<NOD<CLO<SK+0001<EVE0101
#0101
<MSGHere is some dialogue
that you want to
display every time.<NOD<CLO<END
By default, the skipflag 0001 is clear, so the <SKJ command does nothing. However, once #0100 runs once, the skipflag 0001 is set, so the next time #0100 runs, the <SKJ jumps directly to #0101, so the first bit of dialogue is not displayed.