add community plugin/theme to hosted vanilla

I am using a hosted Vanilla instance, and I'd like to try some of the community plugins I see available.
I don't see how to upload these to the hosted vanilla though. Is there an account I am supposed to use to upload to the hosted plugins / themes directories?
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Answers
iam having this error after pressing to activate debut plugin:
this is the error message.
http://www.foropoliticodominicano.org
how i can bring the web to a normal site