To replenish stock in WooCommerce, follow these steps:

1. Log in to your WordPress admin dashboard.
2. Navigate to the WooCommerce plugin settings by clicking on “WooCommerce” in the left-hand menu.
3. In the WooCommerce settings, click on the “Products” tab.
4. Click on the “Inventory” sub-tab.
5. You will see a list of your products with their stock status. Locate the product you want to replenish stock for and click on the “Manage stock” checkbox if it’s not already checked.
6. Enter the current stock quantity of the product in the “Stock quantity” field.
7. If you want to receive a low stock notification when the stock reaches a certain threshold, enter a number in the “Low stock threshold” field.
8. Click on the “Update” button to save the changes.

Now, your product’s stock quantity is replenished in WooCommerce. If you have products with variations, you may need to update the stock for each variation individually.