When unsure about something, whether it be a technical issue or a project convention be sure to ask. If you stay silent you will never make progress.

If it relates to a technical issue ask on the public mailing lists. Avoid the temptation to email the individual person that knows the answer. This way everyone will be able to learn from the question and the answer.

For project specific or administrative questions ask, in order:

Once your question is answered, if no one pointed you to documentation that spelled out the answer to your question, document it, as others will have the same question.