Submitting a writing correction

How do I choose a tutor and request a writing for correction under this new format? I went to the Exchange page, chose a tutor, and tried to submit my writing. I received an error message that says “Your text must be more than 3 words long. Select a valid choice. 12 is not one of the available choices.” My submission is more than 3 words.

Can I submit the writing on the tutor’s personal page? I want to be sure the tutor receives the points for my submission.

I was able to submit my writing for correction and offer the points to the tutor I selected. Thanks.