And if not, where? Specifically I want to know how to re-ask a protected question.
It was not my question, and it was protected because it had received low-quality answers that had had to be deleted.
Yes, it is. However it's more accurate to say it's a great place to find out how to use Stack Exchange. Many questions have already been asked.
You can learn more about the closing process in a canonical question called What is a "closed" or “on hold” question? . In general you do not "re-ask" a closed question. Instead you edit it so that it can be re-opened. More details are at How do you reopen a closed question?
A protected question can still be answered (see What is a “protected” question? ) and you don't need to re-ask it. New and low-rep users can't answer it, but everyone else can. If you'd just like to get more eyes on it because you want to know the answer yourself, see Getting attention for unanswered questions? and consider using some of that advice to get this question answered.
If you want site-specifc advice about how to edit a specific question - what to add, what parts to take out - then this overall Meta is not the best place to ask, and you should ask on the meta of the site where your question was closed. But it was right to come here first, since you have now learned you don't re-ask closed questions, and the difference between closed and protected, among other things.
Meta.SE (this site) is the place to ask questions that apply to the network as a whole. If you have a question about question blocks, the process of closing or reopening questions, or what "primarily opinion-based" means, for example, you can ask here.
If your question is specific to another site, such as "why was this question closed?" or "what do I need to change to get this reopened?", then you need to ask on the meta for your site. People here can't tell you what close voters on Stack Overflow or Parenting or Webmasters expect from questions.
It's always ok to ask general questions on the per-site metas, so if you're not sure, ask there. Even if you don't have enough reputation to participate on meta otherwise, you can always ask specifically about your own question.