The delete button is a circle with a line through it
That's what I meant actually. XD The other button isn't a "stop" symbol technically, since it's a hexagon! But it resembles a stop sign in color. Oh confusingness.
Anyway, that line-through-circle button is what's totally axing my messages instead of moving them to the trash, which is totally not what I wanted to do in both cases stated in this thread. I don't think I changed any settings in webmail for it to do that or anything because I only just recently started really using it (and figuring out how to use it, even). It's actually the most confusing webmail interface I've ever used.
What you just said about Junk must also be why so much of the mail that goes to this address (most of which isn't spam) ends up as "Unsure" too... 'cause I've just been moving older messages there. D: Very enlightened now. Except for my permanently deleted mail. I'll just see if I can drag whatever I want to delete to the trash. I need to be
really careful about this because my most important mail will be going to that box now, and I can't forward it to my other emails.