how can i return a mail order from walmart which has no instructions.

Any local store will take all returns. Carry any paperwork received with the item as well as whatever payment card you used for the transaction and personal identification card as the recipient/purchaser.

Take it to the nearest store

Call them for instructions

Return it to the store. If you have the paperwork from the order they will take it and refund the funds.

Web

There are instructions on the website.