I am thinking that you have clicked on the button, "start a new hub", and have followed the directions: selected title; categorized your hub and selected tag words.
Okay, on your upper right hand side are your capsules, there are many.
You need to choose the capsules you want to add to your article, example:
1) Add Photo - if you are adding a photo select that capsule - then you upload a photo that you have.
2) Add text - if you want to add more text, select that capsule.
Okay, in order to insert in the capsule - go to the bottom left hand side of the screen and select "edit", then add what ever you are adding -- a photo, text, amazon products, a poll.
I hope this helps.
Happy New Year!