To report exports of dyed diesel fuel, dyed kerosene, and gasoline blendstocks in Form 720, you need to complete Part III, Line 3. Here, you will report the total quantity and the tax paid on the exported fuel. You may be eligible for a refund of the tax paid if you have the necessary export documentation and meet the requirements for a refund. Make sure to keep records of the export documentation and other supporting documents to validate your claims.