How do I get the header php back?


I am new to blogging and was trying to add meta tags to my website:
As you can see it is all messed up right now.

I went to the header php and made some changes in the code the reason why the appearance is not what it was.
How do I go back to my original website?

Much appreciated.


You should download the theme again and replace the header.php file or copy the content over.

Let me know if you got it alright and this was the issue or something else.