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you would have to cycle through the letters and numbers. Lets say you want to enter the number '2'. Keep pressing the number 2 button. It will cycle through all the options for that button, ie A,B,C,a,b,c and the 2. You do the same for the other buttons. This is just like how you do on your mobile phone for texting
When the keyboard appears on the printer display, there should be a ARROW pointing up or a TRIANGLE. Press that, and the entire keyboard changes into CAPS. To enter lower case you need to tap the appropriate letter key twice quickly. The first tap should show a capital and the second should show a lower case letter.
you may also refer to below video link
Let me know if that works for you or not and i will suggest further
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