heroku reacher 5 free apps showing varify your account message

hello developers,
i am using heroku free account and i have deployed some apps. now when i create a new app with create heroku command. is shows a message "you reached limit of 5 free apps plz varify your account".
what is this. and how to resolve the problem.

thanx in advance

Why don’t you try reading their documentation? It’s there for a reason.

https://devcenter.heroku.com/categories/billing

https://devcenter.heroku.com/articles/account-verification