how to make ...this item has a no return policy?

[championsforever]

How do you make this change on selling your items/

[ebooksdiva]

If you did have a no return policy. eBay’s Money Back Guarantee over rides that. 
A seller’s no return policy only works for remorse returns.  
But to answer your question, in your business policies you would go to your return policy and toggle returns to no returns. 
ETA: looks like you already figured it out, because I looked at a few of your items no returns are accepted.

[soh.maryl]

Just double checking:  You do know that your "no returns" policy does not override eBay's Money Back Guarantee for buyers, right?  That means that, if a buyer deems an item to be not as described, that buyer can open an item not as described case and you will be required to send him a prepaid return label and to refund in full when you receive the returned item back.  

[mtgraves7984]

I'm confused... it appears that your Sold listings are set up 'No Returns'. If that's what you want, no change is needed.