How to complete a running project?

To complete a project the user has to do the following:

Firstly, login as a client. Because only clients can complete a project.
Go to the Running submenu under the Projects menu.
There the client will find two buttons.
One of them says ‘Complete this’.
By clicking that button the client submits the project as being completed.
And finally the project will move to the Completed submenu under the Projects menu.
*** The payment should also be completed before completing a project. Otherwise, The completing operation will be withheld and a warning message will be shown to the client saying ‘The payment needs to be completed before completing the project’.