Nostalrius Begins - Quality wow vanilla realm (1.12)

So as a warlock one of my duties is to make sure people are properly Soulstoned when we are in a dungeon or raid. And I have ben looking for a way to cast the prepaired Soulstone from my inventort at a specific target, but i can´t seem to get it right.
At the moment i have something like this:

/use [Minor Soulstone]

/s %t is now Soulstoned

Well, something like this is my goal at least... and yes i´ve tried to skip the /s part and tried to take away the [ ].
Anyone out there that has got a working macro for this?

Please help me.

Found how to make it work!

/script UseContainerItem (0,2);

/s Casting Soulstone on %t

For this to work you need to have the Soulstone in the 2:nd slot on the rightmost bag and "casts" on your target.

The 1:st number symbolises the bag 0= the one to the right and then it count up normally.
The 2:nd number is the slot in the designated bag counting from the top left and continue to the right row for row.

Happy SS:ing ^_^

I use this, it always uses soulstone when you have it in your bag, no matter where in the bag.

/Yell own name saved %t's Soul
/use Major Soulstone