how to using apple id om my iphone i dont now how to activate my acount i need help

Hello tlaapi,

Welcome to Apple Support Communities!

You can find some helpful information in this article:

Using your Apple ID for Apple services

http://support.apple.com/kb/HT4895

Here's how to sign in with an Apple ID on your iPhone:

When you first set up your device running iOS 5 or later, enter the Apple ID you use for iTunes in the setup screens. It will be used for Store purchases and iCloud.

If you skipped the setup process, enter your Apple ID in Settings > iCloud and Settings > iTunes and App Stores.

Have a great day,

Jeremy