If you are looking for changing URL then you can not change it, for blog/news you can assign other blog that like "custom" blog then it will open as "blogs/custom" but for product page you can not change.
As i told you you can not change word "/products/product-handle" here you only change "/products/product-handle" and for blog you must redirect to any blog post name so it must contain "/blogs/post-name" here you can change "post-name" but cant "/blog"
The blog titles can be changed. If you look at your existing list of articles in the Admin you should see a link to "manage blogs" top left of screen (but not so far left that it's part of the menu). You can adjust the title in there.
To help avoid confusion, it's always helpful to post a link (or at the very least an image but link is better) to the pages that relate to your question.
It's possible the "products" text you are talking about can be changed in the language settings for your theme but not 100% sure what you're talking about. I can imagine a few places where that text may show so don't want to guess. Can you give some more info?