To start an arbitration, first you need to click on the project link.
Then, scroll down to ‘Communication with client’ and click on the link ‘Send a message’
Communication with Client
After you do so, You need to go to the top of the opened page and click on the option shown in the picture below:
Resolve Issues
You will then have the option of starting an arbitration process which will allow you to resolve problems with the bid in question:
Starting an Arbitration
Then you will be able to cancel the bid explaining the reasons why you need to do it. You can work it our with the client or request a supporter to manage the arbitration.
Bid Canceling