I'm not the author but completed this lately. You are on the right track. It might just be a matter of "guessing the verb", otherwise, perhaps you need to sleep once more before doing what you are trying to.
Here are some commands I used (rot13):
>trg tnf sebz oneebj (V pna'g ubyq gur tnfbyvar, vg'f gbb urnil sbe zr. V qebc vg.)
>qebc nyy
>trg tnf (V abj unir gur tnf)
>ghea pnc (gb bcra gur tnf)
>cbhe tnf va jryy
V qba'g erzrzore vs V jnf noyr gb pneel gur yvg orfbz gbtrgure jvgu gur tnf, vs abg, whfg qb gur nobir svefg, gura yvtug gur orfbz naq:
>guebj orfbz va jryy
I hope this works :)