Yes you will need to add your address on your account by going to Settings > Contact Info > Location > Address before submitting proposals. You will also need to upload profile image of yourself, thank you.
I have been trying to start work on Upwork.. However, whenever I try to apply for a project, I always get a message of updating my address. I have already done this but still struggling to start work. This is so demotivating for freelancers who are willing to work but don't get a chance.
I hope some one at Upwork can help me out.