Hello!
I had this morning the same trouble, and I discovered that if you use this expression:
Set value at yourArray(loopindex,0,0)to tokenat(yourText.text,loopindex,"") (please, notice the blank quote at the end)
It will write in your array the individuals characters of any string, one by one.
The loopindex should be the len of yourText-1, and the array should have to be enough to store the individuals characters, this is, it has to have the same Height, width or Depth than the len of yourText.
And done!