After Posting

Is there any scope for negotiation?

Yes, of course, there is scope for negotiation. You can add a message to your bid while publishing it. You can also initiate a conversation confirming the actual price of the bid. This chat/conversation can be held privately with the employer.

Can I make changes to my bid?

Yes, you can make changes to your bid. Click on the My Bids section available on the menu. Select the offer you want to make changes in. Click on the edit option and make changes to the price and save.