1. Always click on the Profile (right top) to find all your topics.
2. No, I can’t be more specific than the Codex article. Read it while your admin is open at permalink settings and follow the instructions.
So far, I have changed my permalink structure and it works great with anything that I post. However, no pages that I create will become visible on the site and the fixed pages (about and archives) only return a 404 message.