Once you are there, you see a screen with all your keywords. If your default bid is 0.50 and you want to change certain ones to 0.60, you click next to the keyword you want to change, add two asterisks and list your bid.
example:
keyword1
keyword2
keyword3 ** 0.60
keyword4
keyword5 ** 0.60
keyword1, 2 & 4 remain at 0.50 and keyword3 & 5 are now 0.60.
You can also change landing pages for individual keywords to make them more specific by adding another set of asterisks and listing the new url.