I can't connect my wi-fi to my ipod touch. My

The iPod touch has the ability to connect to Wi-Fi networks, giving you access to information while on the go.
The iPod detects both protected and unprotected networks, and can remember which Wi-Fi networks you have used before, eliminating the need to enter passwords more than once.
Your iPod touch should automatically detect wireless networks, but you can also manually connect to a network or switch to a new one.
Tap the "Settings" icon on the home screen and tap the "Wi-Fi" button.
Tap the "On/Off" button to turn your Wi-Fi on. Press the "Home" button to return to the home screen.
Tap the Safari Web Browser application or any other application that requires Internet access.
A list will automatically open on your screen that names all available networks.
Tap the network you wish to use from the list.
The networks listed are all wireless networks detected by the iPod.
Protected networks will have lock icons to the right of their names.
Enter the password if the network you have selected is protected.
Your iPod touch will store this password for future use.
Type in the name of the network you wish to use if it is not listed.
A network that is set to not broadcast will not show up on the list of available networks.
Check the top left of the screen for the Wi-Fi icon to be sure you have connected.
The number of bars on the icon indicates the strength of the signal.
Manually Connect
Tap the "Settings" icon on the home screen and tap the "Wi-Fi" button.
Tap the "On/Off" button to turn your Wi-Fi on.
Tap a network listed under "Choose a Network..."
The networks listed are all wireless networks detected by the iPod.
Protected networks will have lock icons to the right of their names.
Enter the password if the network you have selected is protected.
Your iPod touch will store this password for future use.
Type in the name of the network you wish to use if it is not listed.
A network set not to broadcast will not show up on the list of available networks.
Check the top left of the screen for the Wi-Fi icon to be sure you have connected.
The number of bars on the icon indicates the strength of the signal.


http://support.apple.com/kb/HT2031

Wi-Fi Functionality

1. Connects over the last Wi-Fi network you used that's available.
2. If no Wi-Fi networks you've used are available, iPod touch will scan for Wi-Fi networks and show a list of Wi-Fi networks in range. Tap a network and, if necessary, enter the password to join. Networks that require a password show a lock icon () next to them.
3. Option to manually enter your Wi-Fi network name/SSID (if the Wi-Fi network is configured not to broadcast or be displayed to the public). If necessary, enter the password to join.

When iPod touch is connected to a Wi-Fi network, the Wi-Fi icon () in the status bar at the top of the screen shows connection strength. The more bars you see, the stronger the connection.
Wi-Fi Settings

1. Turn Wi-Fi on or off.
   Choose Settings > Wi-Fi and turn Wi-Fi on or off.
2. Set iPod touch to ask if you want to join a new Wi-Fi network.
   When you are trying to access the Internet, by using Safari or YouTube for example, and you are not in range of a Wi-Fi network you have previously used, this option tells iPod touch to look for another network. iPod touch will display a list of all available Wi-Fi networks that you can choose from. Networks that require a password appear with a lock icon ().
   
   If "Ask to Join Networks" is turned off, you must manually join a network to connect to the Internet when a previously used network is unavailable.
   
   Choose Wi-Fi and turn "Ask to Join Networks" on or off. If you turn "Ask to Join Networks" off, you must join new networks manually.
3. Join a Wi-Fi network manually.
   Choose Wi-Fi, wait a moment as iPod touch detects networks in range, then choose a network. If necessary, enter a password and tap Join. Networks that require a password appear with a lock icon.
4. Make iPod touch forget a network, so that the device doesn't join it automatically. Choose Wi-Fi and tap the arrow () next to a network you've joined before. Then tap "Forget this Network."
5. Connect to a closed Wi-Fi network (an available Wi-Fi network that isn't shown in the list of scanned networks).
   Choose Wi-Fi, then tap Other and enter the network name. If the network requires a password, choose Security, tap the type of security the network uses, and enter the password. You must already know the network name, password, and security type to connect to a closed network. Some Wi-Fi networks may require you to enter or adjust additional settings, such as a client ID or static IP address. Ask the network administrator which settings to use.
6. Adjust settings to connect to a Wi-Fi network
   Choose Wi-Fi, then tap the arrow () next to a network.