I guess you're using my skin :)

Just find the image in /skins/b2evo_ru/img/ and replace it with your own.

yes, I can replace that logo, but how to change the website link from b2evolution to my own? I want to know where can I do this change.Thanks.

/skins/b2evo_ru/index.main.php , somewhere in the top

can not find /skins/b2evo_ru/index.main.php
there is not directory of b2evo_ru, and in addyourcontent/index.main.php no link of b2evolution website. Still not figure it out.

Can you post a link to your blog please?