I lost my password to my Mac book air ! How can i do To recover.

Pleas help me

If is Lion, the old way of using the Password Reset menu choice is no longer available. I'm pretty sure Apple made it a bit more complicated, as now you simply boot off an internal partition, and Apple wanted it to be a tad more secure, by adding in this complexity. Then again, if you know the procedure, then even that security is gone.
You use the following technique to reset the Administrators password on a Lion system with a recovery partition:
Boot to your Lion Recovery Partition, by holding down the Option key while starting, and then selecting the Recovery HD as the boot choice.
Once booted, at the top of the screen is a menu ..., select Utilities / Terminal from the menu bar.
In the Terminal window, type “resetpassword” (without the quotes) and press return. A “Reset Password” window will open. Select your boot volume (your SSD drive) if it is not already selected. Select your administrators username from the menu labeled “Select the user account” if it is not already selected. Follow the prompts to reset the password. Restart the computer from the apple menu.

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