can't connect to internet with instagram on my iPod Touch

- Does it connect when the iPod is connected to other wifi networks? Maybe the network is blocking it.

See:

iOS: Troubleshooting applications purchased from the App Store

Contact the developer/go to their support site if only one app.

Restore from backup. See:

iOS: How to back up

Restore to factory settings/new iPod

Sounds like your network is blocking the ports used by Instagram.

Who is the administrator of the network?

Did yo set up the router yourself or did someone else set it up?

Your english is great

- Reset the iOS device. Nothing will be lost

Reset iOS device: Hold down the On/Off button and the Home button at the same time for at

least ten seconds, until the Apple logo appears.

- Power off and then back on the router

- Reset network settings: Settings>General>Reset>Reset Network Settings

- iOS: Troubleshooting Wi-Fi networks and connections

- iOS: Recommended settings for Wi-Fi routers and access points

- Reset the router and reenter the settings

- Restore from backup. See:

iOS: How to back up

- Restore to factory settings/new iOS device.