How do I get rid of this?

Adding an attachment is very simple. Just hit the Add Attachment button at the top right corner of a reply.
After you click the Add Attachment button, a new window will pop up letting you know how many files you can upload at a time, along with what the file size limit per attachment is. To attach a file, click the + Add Files... button, and then choose a file that you would like to upload from the Browse window that pops up. Once you choose a file, you will see a progress bar for the attachment that is uploading.

Once the attachment has been made, you can use the Insert button to have the attachment appear inline within your post, or you can use the Delete button if you decide against adding an attachment. Otherwise, you can click the Done button found at the bottom of the pop-up window and your attachment file will appear at the very end of your post after your thread has been made.

Not much I can do about that. According to the ProBoards abilities if you're visiting the forum in your browser you'll need to switch to the desktop version of the forum via the button on the bottom right of the page as the Add Attachment button on the posting page isn't available on the mobile version.

If you're using the Tapatalk app on iOS or Android you should have an attachment option available when creating a post. Otherwise you are out of luck.

I switched it to desktop mode. Here's the attachment. Can you tell me how to switch it back?

Go to Settings (keyboard shortcut: Windows + I) > Personalization > Lock screen
Scroll down and turn off the option, "Show Windows background picture on the sign-in screen."

That only got rid of the picture behind the user logo....spotlight.it's still there.....is there a way to get rid of that?

Part 4? Is this what you mean?

Scroll down and turn off the option, "Show Windows background picture on the sign-in screen."

If so, I did that. It removed the picture only...what I want gone is the round user circle in the center of the screen. It remained.