Thank you very much.
The best way to issue a Report is by starting on the movie or person page.

On the Movie / TV / Person homepage, click Report.
Select the Type of Problem
In Extra Details describe the problem if necessary.
In case of Duplicate, inform the link of the original.
In case of images, please state what is necessary to identify them.

This is the only way to Link the problem in the DB for the movie page.

https://www.themoviedb.org/tv/83302

What do you mean with

and if a tv has more than one posters , how can i change the poster?

TIP: If you want to force the line break, click Space 2 times and then click Enter. Just Space > Space > Enter.

Thank you for your help. FOR example， the item https://www.themoviedb.org/tv/83302 has four poster .But the picture which display on the website is not my favourite . How can I change it to another picture.

Poster placement is determined by the number of votes.
More Likes or less Likes.
It's no use voting more than once on the same poster.
The system only considers one vote.

Thank you for your answer. Help file is a little hard for me to underatand .It is different from Chinese website . I should carefully read the help file.