I wrote the inrat 10 and i missed a question

you are on the ground ready to taxy and the atis tells you there is a sigmet

where do get the details before to take off ?

.ground frequency
.departure frequency
.fic
.the air control service

Ground frequency. You could get it from the FIC frequency if it was busy on ground freq (and you could reach the FIC from the ground) but if you ask ground for the SIGMET they'll give it to you.

Reference: TC AIM MET 3.18

thank's