Autofill forms in Bitcoin protocol For example, I have link: 
bitcoin:1DF9jgzftTFn4ZnDV2YEjUtZ4uHtBywj57. If user open this link in browser, bitcoin address automatically insert in address text field. Example for my MultiBit Classic client:



But what should I make in link to have been autocomplete not only field Address but also fields Label and Amount?

Thanks.
There is a standard for Bitcoin URI schemes, and it is defined by BIP 21.

However, that does not mean that every wallet application out there will support all the fields when it it opened from a link.  Most will, but don't be surprised if some fields don't fill in automatically.