Some Thing Like Poptropica How Do You Get On The Last Step Type Thing That Moves Up And Down On Astro Knights Island Poptropica?

How do you get on the last step type thing that moves up and down on astro knights island poptropica? - some thing like poptropica

I need to get something on the edge of not having to enter the volcano also know how to beat the site of the volcano and all kinds of sharks. I hit the bird. THANK YOU! : P