Your name has been hidden so that you are not identifiable. The Editing and Writing sub-section of the forum clearly states at the top that threads in that section cannot be deleted. Even if any corrections there aren't helpful for you, they might be helpful for other learners - that's why they stay there.
Thanks for removing the name. But, my cover letter is showing 75% plagiarism now. That's the main issue. I didn't know about the rules of this forum. Please help, how can I save myself from this. Thanks in advance.
If you don't want something to be findable, don't post it online. If you needed your letter proofread and edited privately, you should have paid a professional proofreader/editor to do it by email (or even on paper!)