Open Products → Moderation (Product Premoderation). The list shows Name, Vendor, Price and Submitted Date.
Use Search by product name or vendor to find a product, or the Pending / Approved / Rejected filters.
Click Preview to see the product page.
Check:
name and description are clear and honest;
photos are the seller's own, sharp, with no other shop's watermark;
category, brand, sizes and colours are right;
price and MRP make sense;
HSN code and tax are filled in;
the item is allowed on your store.
Approve — the product goes live with the visibility the seller chose (active or hidden), and the seller gets an email.
Reject — write the reason (required), for example "Please replace photo 2: it has another shop's logo", and click Confirm Rejection. The seller gets an email with the reason.