Need help about optimize keyword

my old post seo for keyword: home loans for bad credit (xxx. installmentloansclubxcom/enjoying-an-amazing-home-loan-process), I use wordpress SEO by Yoast, but when I go through the page analysis, they say that there is no focus keyword was found in my content, I don't understand why, is there is any mistake?

Can anyone help me?

your site articles or content must have your keywords,at least 2 to 5%

but I wrote it 4 times in my content, why not any of them was found?

the keyword density is 0%