My b2evolution Version: 3.3.3

Where is the option to show the time and author on a blog post? I'm sorry I'm new to the admin dashboard and can't seem to find it.

Also how do I center a Youtube video in my blog? I've used <center></center> and also the actual toolbar where it centers text.

And how do I remove the blue lines bordering my pictures that I posted on my blog?

Thank you all for this great platform and support!