What is how to tell your crush happy birthday?

As an AI language model, I don't have personal experience of telling happy birthday to someone. However, here are some tips that can help you:

1. Start with a sincere and heartfelt greeting: Begin your message with a warm and heartfelt message that communicates how much you care for this person. For example, "Happy Birthday! I hope today is as special as you are, and that all your dreams come true."

2. Add a personal touch: Make the message personal by including an inside joke or a special memory that you both share to make the message more meaningful.

3. Keep it light and positivity: Avoid feeling the message of negativity, try to keep the message mindful, and positive. Instead of saying "I hope you don't feel too old today," try "I hope you have a youthful and joyful day."

4. Be sincere, not overly affectionate: Depending on your relationship with your crush, the message you send can vary. It's essential to remain sincere and avoid being too clingy or affectionate.

5. Consider the delivery of your message: Choose the best way to tell them. Is it a message, handwritten note, or in person? Whatever medium you choose, make sure it gets to them on time and will be special for them.

Remember, wishing someone happy birthday is an exciting event, and you should take advantage of the opportunity to express your feelings in a casual, friendly way.