To put your logo in the header, go to Editor again, then select header.php then look for where it will talk about the site title, etc, replace that line of code with: <img src=”LOGO URL HERE”>
For the text, just do <p>text here</p> wherever you need it to display.
Go to Editor, then style.css, look for something like header and then in between the the curly brace’s { } set background-colour: #hexcolourcode;
Hi Sudeep,
For security issues with the self-hosted version of WordPress, then you should send an email with the details to security [at] ww.wp.xz.cn. Include as much detail as you can.