This video knitting tutorial will help you learn how to knit the purl right loop increase.
Step 1: Take working needle and pick up the purl stitch from the row below and move it onto the main needle
Step 2: Take working needle and insert it into the stitch
Step 3: Wrap yarn around the needle and bring it through the stitch
Step 4: Slip the stitch of main needle
step 5: Purl the next stitch as normal