To validate the product(s),

• Go to Magento admin panel.
• On left navigation bar, click Wish Integration and then Wish Product Listing.

• On clicking it, you will be navigated to a page which appears as:

• Select the products you want to validate.
• Click on Actions on the top left, above the product listing. The menu will appear as:

• As shown in the above image, click the Validate Product.
• On clicking, you will see a box asking you to confirm your action as:

• Click OK.
• You will be navigated to the page showing you the status as:

• The product(s) will be validated.