What is it about "When you reach me"?

In this The story “ When you reach me” is about a twelve years old girl named Miranda who is in single - parents family and lives with her mom. She is friendly and respectful to others. also If she has a question that she can’t figure it out, she will keep asking others and makes herself until she understands. Furthermore, In the beginning of the school year there’s a weird homeless man hovering around in her neighbor. He usually likes to kick into things in the street and shakes his fist at the sky and yells crazy stuff. Sometimes he likes to sleep with his head under the mailbox. Therefore, a few kids called him Quack or Kicker. However, Miranda’s mom thinks it’s an awful name for a human being and decides to call him Laughing man. Then a strange thing happens. Miranda gets a letter that but didn’t doesn't know who is the sender is. The letter says ”I'm coming to save your friend’s life, and my own”. She and her mom feel afraid and weird from it. Miranda thinks the letter never send it to her again, Unfortunately, more letters keep coming. the letter keep sending to her.  In addition, Eventually, she realized the letters tells her future are giving her significant massages about her future.

(I was very confused about "kick into the stree", so I assumed you meant "kick things in the street".  Let me know what you really meant.)

(You keep changing from past tense to present tense.  This is difficult for people who know the Chinese language to understand because Chinese doesn't change the verbs to indicate tense.)