I am slowly discovering features on my kindle. I have a question about collections - I know how to create a collection, I know how to add a book to a collection - but, I can't figure out how to access the collection to see what is in it. Help :-)

It is a sort option on the home screen.  on the kindle paperwhite it is the word on the far right just below the icon row.  touch it and you can select recent, author, title or collection for sort order.

it is in about the same place on the kindle keyboard, use the 5 way controller to move up to the row and then the right to get the selection list.

I would think the other models would have it in about the same location 

Thankyou Ronda - with your help I worked it out :-)

I have a kindle paperlight - when I initially looked, the "collection" under the sort option was greyed out. However, when I changed "my items" from books to 'all items" the collections magically appeared and became am option under 'sort".

I am realising the kindle has lots if little features, but, unless you "go exploring" or read forums, they are ....discreet.