Looks like I have to reinstall mediawiki. It is fine because I have not been able to do much yet. But, are we saying there is no way to create an ID in sysop group after the installation?
Only sysops can make new sysops (using Special:Userrights), so if you've lost the password to the sysop account you created at installation, you are stuck. If you have email set up, you can just ask mediawiki to email you a new password. If not, you will have to edit the database manually, or reinstall.
Also, everytime I ask a question, someone feed me one spoon of "using Special:Xxxx". It is like magic! Where do you guys hide your secret book? Can I get one to hide too? :))
Use Special:Specialpages ;)