Go to the icon that looks like this in the lower right corner of your screen.
Click on it and it will pop up. In the upper left corner of that window, you will find an icon for your connection settings.
Click the arrow pointing to the right.
Find the SSID (network name) that you set earlier and click on it.
Enter the password that you set and click connect. You should now be able to browse the internet.
If you are not able to connect at this point, then you will probably need to investigate your ISP (Internet Service Provider) connection settings. That will be covered in a different article. For now, it would be a good idea to call your provider and have them walk you through setting up their modem.