The easiest way is to create a board from your news feed and a pin.
Log into Pinterest https://www.pinterest.com.au/homefeed
See an image you would like to Pin
Click on the image and this opens up a new screen
Scroll to the bottom
Click Create board , complete the details
Enter a name for your board and click the box next to “Visibility” if you want to keep this board secret
Click into the “Add dates” field to add a start and end date
Click Create