Adding a logo in wordpress

I would like to add a logo to wordpress to replace the plain title.

What do I have to do to add my logo?

The logo for the template, or the logo on the login page?

Logo on the template

Appearance > Customize

You can find this either on Theme options on the dashboard navigation or under Appearance > Theme Options. If your current theme doesn’t support it, you can visit the editor on Appearance > Editor look for header.php and check out logo class. Make sure you have a backup first. If ever you needed more help, just post here.