How to add lables when my mega2560 digitalread is HIGH

Please read the Welcome Topic… I had to fix your post to properly show posted code.

Blynk%20-%20FTFC

And then start reading the documentation for Blynk and proper use of code and structure with Blynk…

http://help.blynk.cc/getting-started-library-auth-token-code-examples/blynk-basics/keep-your-void-loop-clean