How can I change "My account" for Customer

[EvgenyR]

Hello, everybody!
I wanna to create drop down menu in My account for the customer.
Goals: When customer wants return an item, he choose a product for return. And I want that he may to choose different reasons for return this item (Accidental order, Missed estimated delivery date etc). And without reason he can t  make the next step.
Also I have idea paste buttons Select your Shipping Method and Print you shipping label and how can I do it technically? 
Help me please to resolved this problems.
Thanx 
Best,
Eugene