First open wow studio and open the file Model in the wow data folder as shown in the SS.
Now make a new folder in ur wow data folder called Creature as shown bellow.
In this folder make a folder called RidingFrostSabre
Now go back to Mywarcraftstudio and scroll down all the way in the creatures folder and u will find a file called whyvern open it then select and right like then press extract file to.
Extract the file to your wow data/Creature/RidingFrostSabre
Now change the name from Whvern.m2 to RidingFrostSabre.m2
Now click pack and save the file to ur WorldOfWarcraft/Data folder as speech2.HAVE FUN !!!!!