If I understand your question correctly, you are confused about Betfair and finding the lay column??
Just remember PINK is the LAY bet, and BLUE is the BACK bet. With matched betting we will always LAY our bet!
If you looking at an event on the Betfair homepage, there will be two back ad two lay columns. These are just for the two different teams etc.
Go into any actual event and you’ll be able to see how you can lay a certain team or outcome.
It’s real simple!