Please help about changing the logo on wordpress

Hi

I need a help from helpful people

I have a wordpress blog but i can't change the logo written by wordpress with my png logo.

Can anyone give me advices?

Which codes should i write and stylesheet or header?

Thanks

 

No one can answer that question without more info. We need the active theme name and the url.

 

sorry i forgot to mention about my site.
my site address is: http://www.autotua.net
my theme is delphi

thanks

 

There is usually an option in the theme settings. Often they fail to update because of things like this:
logo.PNG is not the same as logo.png so make sure the file name is correct
If that fails you can always go into the header and hack the code (save the old version as old-header.php) using ftp and a text editor.
You find out where the current logo is displaying and remove those lines of php and then just hard code the new one in like this:
<div class="logo-area-new"><img title="newlogo.png">newlogo.png</img></div>

 

Thank you for your detailed reply but it didn't work.
In case i am pasting the code related with logo from header.php

can you please check it?
if you need more info i can supply
thanks

 

that is plain text on your site title.
to put and image instead replace with that code with

 

Hey thank you for your help, let me try and i am going to inform you if it works!

 

No it didn't work, logo didn't show up and whole site design was broken
in case if it helps, i wanted to show the style codes

 

It should work.
does your logo even exist ?!
http://www.autotua.net/wp-content/themes/Delphi/images/logo.png

 

yeah but not there
http://autotua.net/wp-content/uploads/2013/12/autotua.png

 

it worked! but there is problem logo stays under the line so how can i align to the center? can you please check it?
logo style:

 

thank you for your effort and help!
this is really good but logo is now a little bit small, so is it possible for us to enlarge it?
also i don't want it to be stay over the wrapper, is it possible for us to make the wrapper start after logo?

 

so how can i enlarge logo and make it appear at the right of orange wrapper?

 

Hi
1st give some height your menu header .Then use big image for enlarge logo.And for right of orange wrapper there is many different ways like float:right;