Click anywhere in the status area to expand it: Among other basic settings, it’ll show your current connection in the Network bar near the top. If you’re connected to a network, it should say, “Connected to [Network Name].”

scan and connect to different networks
When you scan for networks, a list of Wi-Fi networks will appear in the status area popup.
If it says “No Network,” click the box to open up a list of available Wi-Fi Networks. You can click Join other... or Settings at the bottom to enter a network manually.
Click the Settings bar at the bottom of the expanded status area to launch into the full Settings page within the Chrome browser, which delves deeper into your Chromebook’s settings. In the Internet Connection section at the top, you can allow proxies for shared networks and edit your saved wireless connections.
wireless settings in chrome
The wireless settings in Chrome are a bit more advanced than the simple controls in the status bar.

Make sure your Chromebook is connected to Wi-Fi

If the password for the network you’re trying to connect to has changed, you’ll need to re-configure the connection to update the password. From the list of available networks in the Settings tab in Chrome, click the network name you want to connect to.

check your wpa password
Check that your WPA password is indeed correct by clicking on Configure.
Click the Configure button at the bottom of the pop-up window to enter the new password and click Connect.
enter new wpa password
In the dialog that pops up, enter the WPA password for your WI-Fi network.

Run Google’s diagnostic tool

If you’re actually connected to a network but are having issues with your connection, you’ll want to run Google’s Chrome Connectivity Diagnostics App built specifically for Chromebooks.
google diagnostic tool not connected
Google’s Diagnostic Tool will help you identify connection problems and reccommend action if there is anything you can do.
The app runs a detailed diagnostic that gives you in-depth information on what could be causing you trouble. It makes sure Chrome is up-to-date, checks for a DNS server, and it also checks whether internet traffic is being blocked by a captive portal.
google diagnostic tool issue identified
The Diagnostic Tool will test each part of your connection to find what’s slowing you down or keeping you from working.

Reboot all the things!

If you’ve tried everything listed above, your laptop likely isn’t the problem. When in doubt, follow the age-old advice of turning everything off and on again.
Turn your Chromebook off, turn the modem off, and turn off the router if you have a separate one. Wait a good minute or two, then begin rebooting your devices. Start with the modem, followed by the router and then, finally, your Chromebook. If that doesn’t fix your problem, move on to the next step.