Step 1: Log into your Joomla 3.0 Administrative Dashboard
Step 2: In the top menu, click Content and then click Article Manager
Step 3:In the list of articles on the page, click the title of the article that you would like to adjust the Show Author setting for
Step 4:In the tabs above the article, click the Article Options tab
Step 5:Find the setting labeled Show Author. Next to it, choose either Use Global, Hide, or Show. Then, click the Save button in the top left of the page.