Hi Sandy-
Welcome to the Banana Express.
If your plant is indoors and already reaching the top of the second floor, why would you need to make it grow any taller, or am I reading that incorrectly?
To post a picture, you cannot upload directly to the post. You have to either link from an offline site like Photo Bucket, or post it in your gallery on here and then show the link just like from an off site location. It's a crazy system, but that's the only way to post pics on here.
Hope this helps!