Summarize this article:

Use the quilting ruler to measure your liner to fit the measurements of the shelves that you wrote down earlier. Mark the top and bottom of the paper with a pencil or pen. Use scissors or place a cutting mat underneath the liner and then cut it with a rotary cutter. Use the quilting ruler as a guide while you're cutting the liner. Repeat this process to create as many pieces of liner as there are shelves. Take the backing off of your contact liner paper and carefully place it on your shelf. Go over the liner with a squeegee to eliminate any bubbles or wrinkles. Put a small blob of reusable mounting putty in each corner of the cabinet before placing in spongy or plastic liner to secure it. One by one, take the pre-cut pieces of liner, place them in each shelf space, and smooth them out until all of your shelves are lined.

Summary:
Measure the liner material. Cut the liner material. Place the liner on the shelf and smooth it out. Repeat these actions for each shelf in your kitchen cabinets.