You can ping the site's maintainer, @Dennis, in talk.tryitonline.net. Bug reports and language requests tend to be resolved withing the same day of them being submitted, because Dennis is awesome.
Re:TIO: Try it online
by TryItOnline on Monday July 17, 2017 @03:52PM
(#14791813)
talk.tryitonline.net requires an SE account and 20 rep.
There's also https://gitter.im/tryitonline/Requests (requires a Gitter account), https://github.com/TryItOnline/tryitonline/issues (requires a GitHUb account), and email ([email protected]).
Re:TIO: Try it online
by TryItOnline on Monday July 17, 2017 @03:50PM
(#14791784)
For the record, hello world in elixir is
IO.puts "Hello World"