Unbolt small aluminum cover plate on the front of the bell housing underneath.
Have a look up inside and you will see a load of small-ish bolt heads near the starter ring -it's not these!
Look deeper, and you will see 4 ~ 17mm headed bolts, you undo these with either a slim 3/8" ratchet and 17mm socket, or an open ended spanner, undo one, rotate the converter, undo another etc etc untill a;; 4 are clear, the torque converter should now rotate independantly of the flextplate/start ring, if so undo all the bell housing bolts and job done.
If you get it wrong, it's no biggie, you just lose a couple of litres of ATF on the floor, and have to spend about 20 mins refitting the converter to the box -have as search if needed, this is covered by me and others elswhere on the forum.
HTH
*edit* Hop it doesn't look like this when you get it out