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Similar issue encountered. Did you enter only @username? Or did you go: www.steemit.com/@username?

Yes, use your steemit username: @username And enter 0.143 into the payment amount box

Will try again. It doesn't seem to work!

Does it say you have 0.143 available for withdrawal? Perhaps it has paid out your daily amount already, but to the first address you entered, which may have been the url link instead of username only? I made this mistake on my first attempt and had to wait a day to try again.

It still says that but when you put in that amount, it ends up showing a dollar amount instead! Thus, it doesn't process!

Weird. It might be worth contacting @klye directly. He will know the answer.

If you are doing it for the first time the total you can withdraw is 0.143 steem, so that's the amount you need to enter. And use your steemit username as payment address.