Begin by using the SEARCH Thingiverse search box to look for images you might want.
Once you have something you want, use the collection Tab to make a collection folder for the images.
If you click on the image you can Choose the THING Files button to download the image to your computer.
NOTE: Make sure you have installed the Makerbot Print application FIRST for your 3D printer. This will allow you to print your images.
Files are downloaded as STL so they are in the right format to send to your printer.
If you open an image you downloaded through Thingiverse it should open in Maker Print application.
When you open images in Makerbot Print it will also tell the length of time needed to print an object.