amazon app and blue tooth key boards

Hi folks,
I wanted to know in the Amazon app when viewing an item how can I get the description.
I had a friend send me links to blue tooth key boards and can't figure out how to find discriptions.
Also does anyone have any good blue tooth key board suggestions to use with iPhone 6s.
Maybe a little one for traveling and a bigger one.
There seems to be good sales on keyboards today but I don't know what would work.
Thanks
Carlos