ok so what I need is a type of cover letter of 2-3 pages
Your response should be a two-three page essay that may be written in the form of an extended cover letter. Most importantly, your essay must include a detailed response to each of the key selection criteria explaining how YOU meet the criteria. Your response should indicate that you are familiar with the requirement and have demonstratable evidence of your mastery of the required skill.
The Highlighted part is the job I am applying for and I need the cover letter of 2-3 pages responding to that job