I want to know how to meet you both in person? I really wanna learn some more, and better dance moves!?

It's difficult to meet famous people... And remember Earth is really big o_o That's not going to be easy u.u

But you can try to search in their website some 'Contact Me' link...
But I already searched.. so... just check these links:
Bella ~ link
Zendaya ~ link

Hope it helps ;)