Hello Pongleung, and welcome to Wikipedia! As you are getting started, you may benefit from following some of the links below, which will help you get the most out of Wikipedia. You certainly don't need to read them all now, but it may help to keep them around as a future quick reference guide. If you have any questions you can ask me on my talk page, or place {{helpme}} on your talk page and ask your question there. Please remember to sign your name on talk pages by clicking or by typing four tildes "~~~~"; this will automatically produce your name and the date. If you are already loving Wikipedia you might want to consider being "adopted" by a more experienced editor or joining a WikiProject to collaborate with others in creating and improving articles of your interest. Click here for a directory of all the WikiProjects. Finally, please do your best to always fill in the edit summary field. Happy editing! 706:19, 24 June 2010 (UTC)[reply]
Re: Nelson Mandella - if your requested edit is non-controversial then please see this page for instructions on how to request it. If it is a more significant edit then please discuss it on the articles "DISCUSSION" or "TALK" page first. Thanks. 706:19, 24 June 2010 (UTC)[reply]