How to close app on iphone 3gs?

I want to ask how to close an app on iphone 3gs with home button that doesn't work. Do you have any solution? I made enabled on home screem home button, but I don't know how to close in this way the apps.
P.S Sorry for my English.

Double click home button. Then hold the app icons on the bottom bar that appears and click the minus on them. Hope this helps, good luck!

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