how to automatically change thread prefix

[HumanError]

anyone know how to automatically change thread prefix to solved ?

example
How to make a omlet ..

and i answer

This is how to make omlet bla bla bla bla

if you think this thread is solved/done please click this link(or image mode to )

and then the thread prefix automatically change to solved

From [Question] to [Solved]
thanks

[ZiNgA BuRgA]

You may be able to code up a HTML form which just submits a changed field value.
If you are unsure of how to do this, do a search on how to code HTML forms.