God bless you this day.
When you want to share text from other computer files - highlight the text using the mouse, and then click control key and the letter c to copy the text. Then go to the open file on this site where you want to copy that text, put your mouse cursor where you want the copied text to begin and click control key and the letter v to paste it.
Practice it a couple times and you'll see what I mean. Hope this helps.
God bless and keep you, JohnR.
In Christ Jesus' love,