1. Search for a reputable online pharmacy that offers metformin. Make sure to check the price, shipping options, and return policies before making your purchase. 2. Once you have found a suitable option, click on the "Order" button or similar on the website of the online pharmacy you've chosen. This will take you to a page where you can fill in your personal information and prescription details. Be sure to doublecheck all the information before submitting your order. 3. After filling in your information, select "Visa" or "Mastercard" as your payment method. You may be asked to enter additional information such as the card number, expiration date, and security code. 4. Review your order details one last time, then submit your payment information. This will complete your online metformin order. It's important to note that when you order medications from an online pharmacy, it is essential to check if the online pharmacy is legally operating and licensed in the country where you reside, as well as in the country where the online pharmacy is located. Also, it is always recommended to consult your doctor before ordering any medication online, especially if you're taking other medications or have any health conditions.