Copy - right click on the item you want to copy, and select Copy
Paste - right click on the item you want to paste, and select Paste
Copy - Ctrl + C on the item you want to Copy
Paste - Ctrl + V on the item you want to Paste
When you copy something, it's copied to the Clipboard. It remains there until you copy something else. When you copy something else, whatever is on the clipboard is erased and replaced with the new copied item.
So, for example, let's say you want to Copy a URL. Go to the address bar in your browser and double-click. When the entire URL is highlighted, right-click on it and select Copy or hit the Control key and the C key at the same time.
Then, in the post you're creating on Stovebolt, right-click and select Paste or type Control-V.