HTTPS (TLS certs)

Free TLS certs are available from

Is it possible to have one of these added to this site to ensure that all data sent by users (posts, usernames, passwords) are not sent in plain text?

I added one to a webapp I was running for an office football comp and it took less than half an hour (and I'd never installed a cert before). This may take more or less time depending upon how this site is hosted.