Chris, best to get Blynk connecting to the wifi before trying my code.
Use the PushData example first... get it working... create an understanding of how Blynk connects and get used to the app and adding widgets.
Once you have it connected to Blynk, and you can see the UP TIME counter moving on the app... then you can copy the auth code and wifi settings on to the LED project.
First thing you need to know is the SSID and PASSWORD to your normal wifi network you would use on your phone.
The SSID is the name of the network.
Once you have both of these, put them in to the code where it asks you. Then enter your auth code from the app.
Give that a go first and let us know how you get on!
And Coatas is correct, the Digital Pin numbers on the board do not translate to Arduino.
Refer to the image: See how D1 is actually GPIO5 (or pin 5) and D7 is GPIO13 or pin 13 in arduino (not pin 7)