To save a particular listing, click on the "Save" button on the listing.
To ensure your saved listings and notes are saved across all devices, mobile and desktop, and accessible from anywhere, create a free My Little Salesman account. Additional benefits:
Ability to email your saved listings (and optionally notes) to yourself or someone else
Save your exact search, such as a "Peterbilt 377 Tandem Axle Dump Truck", so that you can quickly jump to that same search again
Create an Email Alert to be automatically notified when new matching listings are added to MyLittleSalesman.com