This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
Assuming you have deployed your program already, you just do that again. Right clicking the server in the server perspective is the most common way. If this doesn't help, please post what server you are using (Tomcat, JBoss, etc) and a sentence on how you deployed the first time.