If you have X running, open the Chromium web browser (globe icon) and navigate to the URL of your favourite electronics supplier.
If you are using a command line, the ping command can be used to see if you are reaching the internet. Try ping google.com or ping adafruit.com to check if you can reach those sites!
ping adafruit.com
Fixing WiFI Dropout Issues
If you find your external WiFi adapter kernel module 'drops out' from time to time, you can fix it fairly easily with a command line fix (thanks perseus286!)
Create and edit a new file in /etc/modprobe.d/8192cu.conf
sudo nano /etc/modprobe.d/8192cu.conf
and paste the following in
# Disable power saving
options 8192cu rtw_power_mgnt=0 rtw_enusbss=1 rtw_ips_mode=1
Then reboot with sudo reboot
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