How do you turn into a toad with Desch tagging along in the tower of Orion in final fantasy III?

Dear fellow Final Fantasy III Player,

Go to the Argus Castle, don't go in but head northwest along the rocks until you reach a small gap of rocks. Enter, head more west to find a cave. Go in, Go down the stair case. Talk to the monk in the middle and he'll give you toad. There is also a small hidden tunnel among the walls, you should get some staffs etc. Then you can toad but if you white mage is around lv 14 he can only use it four times all for your crew. You have to turn back into humans to fight Medusa etc. so bring 4 maiden's kisses.

Sincerely, SkaterSmartAssNerd

P.S. - Need anymore help just ask me.