We expect you to be very careful and read all the specifications before you accept the project.
However, if you definitely need to pass on the project, you can click the Reject button on the project so it becomes available again.
This action will trigger an expiration on your profile to note that you rejected a project and didn’t deliver it.
In case your stats start piling up too many expirations, and you are not utilizing the Vacation settings in your profile when you are unable to work on projects for a period of time, the system may stop sending you invitations to work on more projects.
So keep in mind to only accept projects that you are able to work on as soon as possible.