How to – simple one line with dynamic content managed in admin

Hello everyone,

I think, this must be easy to do, but i’m not great at PHP so I need an advice. I just want to have one line at top of my web with company adress and i want to edit this adress in WP administration. So far i think about registrating one sidebar at the top and give a HTML widget on it, but isn’t there more simple solution? And i don’t want to use ‘web description’ from main Settings – I’m using it elsewhere. Best would be to just add new line in main Settings like “Adress” so i can call it in my template PHP like <?php bloginfo (‘my-custom-adress’);?> or something. If it’s possible pleas help. ??