Click on Buy Menu or from the home page, click on Start Buying Button.
You will be directed to the page that looks like the one below .
To pay for the book using Mpesa;
Go to Mpesa Menu
Lipa na M-PESA
Pay Bill
Enter Business Number :770783
Enter Account Number: Your name
Enter Amount: Ksh 4,000
Enter Mpesa PIN
Click OK to confirm payment