You can use Sketch Builder. Everything is ready here
Study the code.
Later add the function i have given. call the function using Blynk timer or place it inside the loop.
define the LED pins and change it in the snippet code provided.
Then its better you start to learn basics of C++. You can find many good pieces of code in this forum which will help you to grab things more quickly…
the above post is from @Gunner there are some really interesting code going on. Study this for having an idea.