Updating PHP settings?

Our website is turning up an error saying ‘missing a temporary folder’ whenever I try to upload an image onto the site.

Apparently this is caused by incorrect PHP settings in the WordPress hosting environment but I don’t think I am tech savvy enough to try it.

How do I go about getting this issue resolved?

I am afraid this is a question for your host. Cloudflare does not host your site and does not control your PHP setup.