As VLAZ says worldbuilding meta isn't for asking worldbuilding questions it's for asking questions about the worldbuilding site. Other websites may not make a distinction between, meta discussion, about the site, and the rest of the activity, or keep it in the same place but tag it differently. On the SO network the two are deliberately kept somewhat separate.
Your reputation and privleges from the main site automatically carry over and voting on meta will have no effect on your rep on either site.
If you encounter a technical issue, are unsure of some aspect of site policy, or want to propose a change to said policy, you can post on the meta site about that and keep the questions about building fictional worlds to the main site.
Coincidentally asking what's the difference between meta and the main site is a great example of a question that should be asked on meta and not the main site.