re: "Why do non of your support options on the website work?"
Support options do work, the most important of which is this very supportive Community Forum.
As for your other question: "I'm trying to submit a proposal [but] it won't allow me to type in expected length of project. Therefore I cannot submit my proposal."
I am confused by your question. Because I do not recall any field on job proposal submission forms that asks freelancers to "type in the expected length of a project."
What you said reminds me of two input controls on the submission pages for fixed-price contracts.
But those are point-and-click inputs. There is no typing involved.