RE: My not being able to upload an image for my avatar. It's not you, it's me. Specifically, it was my browser. I first tried using Firefox, which is the browser I've always used since signing up for startrek.website. Even though I thought I had fully allowed startrek.website on Firefox, I wondered if there was something under Firefox's hood that was the problem. What I love about Firefox can at times be problematic, what with the blocking of this, that, or the other.
So, I just tried again to add an avatar, this time using Chrome. I seldom use Chrome because it is a lot more loosey-goosey than Firefox about giving websites permissions. I was able to give myself an avatar when using Chrome to access startrek.website. I can see my avatar, and everyone else's on Firefox and Chrome. The why of the situation is far beyond my skill set to explain. I'm going with "it worked."
Thank you both for your prompt replies and suggestions. LLAP.