Oh, you don't attach links. You just copy and paste into the message text. Here's how:
1 - Place the mouse over the blue underlined text.
2 - Right-click, which will display what's called a context menu.
3 - Choose Copy Link Location. The exact words might have changed for Windows 10, so possibly it might be "Copy Link" or "Copy URL" or something like that. This copies the URL (or address) onto the clipboard (which you can't actually see - I guess it's a virtual clipboard).
4 - Put the cursor into the message editor.
5 - Click once, and then Paste. You can use right-click again, then choose Paste. Or use the key shortcut Ctrl v
Whatever you paste will usually start with https:// Not always, but usually. And it will usually end with .com or .org or .net, etc. Sometimes the links can be 2 or 3 lines long. But usually I'd say they average 1 to 1.5 inches in length.
We really do need the links, because there are approx 300 external extensions, and often there are 2 or 3 or even more which do very similar things. For example, there must be 8 or 10 boxmaker extensions. So we need to be sure to download the same one you're using, or we might be giving you the wrong instructions.
Oh my goodness, that file manager in Windows 10 is very different indeed! I knew there was a good reason I returned my new Windows 10 machine! And, the file structure is exactly like you described. I thought you must have been just misreading what you saw, but it's exactly what you described. Unfortunately, I don't know what it means.
Is there any chance that you had copied the k2qwr folder, and pasted it inside k2qwr, and renamed it k2qwrki? I guess probably not, but that's the only way I can think that might have happened. Unless there's some new kind of feature in Windows 10 that I'm just not aware of.
But I guess the bottom line is that I don't feel comfortable saying that it's ok to delete k2qwrki. However it happened, it appears to be a user folder which is inside another user folder. I'm just not sure enough what it means.
However, you should be able to rename k2qwr. And I don't see why you can't name it k2qwrki....except that it could become confusing at some point. Hhmm, but how to change that name..... Do you have a control panel in Windows 10? If so, go to Start menu > Control Panel > User Accounts. There should be an option there to choose your username and change it.
The hidden files and folders are not duplicates, and not clutter, but have some purpose. I'm just not sure what it means or what the purpose is, of a user folder inside another user folder. And by the way, Windows has TONS of hidden files, some which even some Windows experts can't find. They are system files which MS does not want its users to have access to (mostly for safety reasons, but probably also MS (Microsoft) just being MS
).
So I guess I can't help any further with your files. But once we have the links for those extensions, we can help you learn how they work.