Now that you've selected your text, it's time to copy it. On most tablets, you can do this by tapping the copy button, which usually looks like a little clipboard. Don't worry if you can't find it, it's not hidden in a treasure chest or anything.
If you're using an iPad, you can also use the Share menu to copy text. Just tap the share icon, and then select copy from the menu. Easy peasy, lemon squeezy!