When installing McAfee it asks for a six figure code.
The code consists of four numbers and two letters.
When I use the key pad I can enter the figures but not the letters.
Cannot find a shift key in order to enter the letters
Looking at your picture, it's just a matter of repeatedly clicking one of the keys until the right character appears;
For example; press the number 2 button once and you get 2, press it twice in quick succession and you get A, 3 times for B and 4 times for C