how do i find my iphone i lost

If you activated Find My iPhone (in Settings>icloud), and if the device's batteries still have a charge, the device is not turned off and has not been reset and is connected to wifi, then you can try to track it. Using a computer, log into icloud.com and look at the Find My iPhone page. On a device, invoke the Find My iPhone app (get it for free at the itunes app store) and log into the icloud account.

If it is offline, then one of the requirements listed above is not met (like being connected to wifi, or if the device was stolen and the thief reset it).

I am not sure if set in I-cloud but it syncr with my lap top

forestbreeze wrote:

I am not sure if set in I-cloud but it syncr with my lap top

Syncing with iTuens won't help you locate it. If you didn't set up Find My iPhone on it before it was lost you can't track it. Read this: http://support.apple.com/kb/HT5668.