I'm a school teacher. My school has a web site. I'm the site manager. The site has installed a basic editor to write articles with. The "copy- paste" buttons don't work and the following message appears "Copy/Cut/Paste is not available in Mozilla and Firefox.". How can I change that? Is it possible? If there's a way use simple words please, because english isn't my native language and I'm not experianced with technical terms.

Thank you