how to put keyword in e commerce website

how to put keyword in e commerce website when there is no written content on that page.
people use those keywords which seems nowhere in their page

You should use analytics to see which keywords are converting the highest. and use PPC campaigns to find high-converting keywords you should add to your SEO strategy.
Use your short-tail keyword terms to decide what you want to name your category pages. I would recommend using this short-tail keyword term in your page title, header, and include it in the paragraph.

dealindigital said:

how to put keyword in e commerce website when there is no written content on that page.

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I'd say get written content on the page?

If I understand your question right, You could use your keyword on both title and description in a natural way.