How to uninstall an application on my iPhone?

I know how to delete an app by putting my finger on the app for a couple seconds and xing it out, but I mean after that. My phone is being kinda slow and I can't figure it out.

1) Close Down Apps - Each time you open an app on your iPhone it now remains open, and this can slow the iPhone down. To view the Apps that are open and therefore multitasking double-click the Home button and the multitasking interface will pop up.

A menu will appear at the bottom of the screen showing the open apps. To view all the open apps simple swipe left and right on the menu.

To remove a multi-tasking app tap-hold on the app in the multitasking bar that you wish to close until it begins to wiggle. Finally, tap on the minus badge that appears in the upper-left of the app's icon. The next time you launch the app, it will launch from scratch.

2) Reset Your iPhone - Press and hold the Sleep/Wake button and the Home button at the same time for at least ten seconds, until the Apple logo appears.

When you reset you should not loose any of your data, however if you were entering data into an application this may be lost.

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