[header] How to write an apology letter [title] State what your letter is about. [step] It's a good idea to begin by letting them know that this letter is an apology. This will give them the chance to put themselves, emotionally, in the right place to read the rest of your letter. 
You don't want them to be confused about why you're writing or what you're going to say. [substeps] Say something like: " i wanted to write you a letter to apologize for what i did ".