It is enough to you for every letter of the first name previously defined to slide and to put down the good phonogram UNILITERE.
When you select a phonogram, a help appears : it shows the identifier as well as the value of the hieroglyph - example : G17[m]. What interests us it is the value of the hieroglyph which corresponds to one letter of first name.
In this example, the hieroglyph which has as identifying "G17" has for value "m".