You don't use letters like ó,ś, ć,etc.during your registration. You just spell your name the way it is on your ID without any marks. It means that instead of "ó" type "o", instead of "ś type "s", instead of "Śląsk" type "Slask" and you will be fine. I assume that you're Polish so just follow these rules and you will not have any problems with registration.