How to append text with paste?
On Android, to paste text, all you have to do, is long press anywhere after the last words that are displayed at the moment. This will bring up a few options, and one of them will be paste press on that, and the text will appear where you want it to.

In the screenshot below, if you want to paste something after the word here all you have to do, is long press where the red circle is (or anywhere along the line). This can get tricky in a situation where you want to paste between words.