Step 1: Get sealed envelope transcripts from University, Institution from which you did you post-secondary studies. (Check out the required documents from WES website)
Step 2: Go to WES website and fill the form and pay the fee.
Step 3: Print the form that you filled up on the WES website.
Step 4: Put all the transcripts in an envelope alongwith the WES form.
Step 5: Courier the envelope to WES.
Each step can be further elaborated. You may please goto WES website, they have provided a step by step guide of the entire process.