How to remove displaying site name below logo in phpBB3

There are 2 ways

1) Make the site name empty

Read my earlier post here.

how to change the default yourdomain.com site name

This is not good way as sitename value is used on other places also so avoid it.

2) This should be the correct way

From ACP->Styles->Templates

Select your template and edit the overall_header.html file

Search for the line

<h1>{SITENAME}</h1>

And comment it

<!– <h1>{SITENAME}</h1> –>

phpBB3