If you are doing a poem and you want it line by line, then you need to do it just like that. Key is to make sure you see in the log that you succeeded in the rolls. I wasn't the other day with Salema and couldn't figure out why the description on the sign wasn't changing... then I realized my derp mistake XD
To do line by line, just do the ds_j append [text] for each line that you are scribing. So:
ds_j append [line 1]
ds_j append [line 2]
ds_j append [line 3]
And so on. That's how you'd want to, because each append command bumps you to the line after your last text on whatever it is.
Also, if you want a blank line, ds_j append [spacebar] works for that
