I suspect that meta keywords have little or no importance. There was a time when search engines relied on them, but now search engines take all the content into account. If you want to add meta keywords, users of your site will not notice any difference. They will certainly not mess anything up.
Andrew Nevins
(@anevins)
WCLDN 2018 Contributor | Volunteer support
Would this have been the responsibility of the web designer?
You need to contact your Web designer about this, we wouldn’t know.