I committed to following a new site, but there doesn't seem to be any way to interact or ask questions now that the site is in private beta.
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When you visit the propsal now there should be a "Visit the Site now" link there. You also should have gotten an email with a link to the new site.
This is an example from the most recently launched Biology site, see the "Visit the site now!" link.
If you didn't commit to the proposal before it entered private beta, the only* way to participate in the site is to wait until it enters public beta.
* Or, someone already in the private beta can invite you