The Application Center does not allow you to remove applications. To remove applications, complete the following steps: 

1. On your BlackBerry smartphone, go to Options > Advanced Options > Applications.
2. Highlight the application you want to remove.
3. Display the menu and click Delete.

Source: BlackBerry

Related posts:

1. Force the detection of the BlackBerry smartphone using Application Loader
2. Save applications on you memory card with Aerize Card Loader
3. Compatibility Mode for BlackBerry Storm
4. BlackBerry Application Storefront
5. Random How To: Changing the Number of Password Attempts on BlackBerry Smartphone
6. BlackBerry users covet the choices iPhone users have with some 15,000 applications
7. BlackBerry Car Finder Application Review
8. BlackBerry Application Store out for BETA
9. TheStreet.com Application Now Available
10. SmartFlicks – Your Netflix Mobile Application