Notice the Type Tool dialog box below:
The top command on the Edit menu will say Undo Type Tool,
immediately after you click OK.
You can get the text centered on your command button by trial and error.
My favorite setting for doing this is shown below. Alignment Center in
the 1st button in the 2nd row.
You could also approach it with Alignment Left,
1st button in 1st
row and just Size the Font larger or smaller until it fit.
The text tool button looks like the letter T.
Another method for positioning the text layer (your name) would be to
use the MOVE tool. Type V as in Vicki to invoke the moVe tool. Then drag
the name layer until it is centered on your button.
The Size 30 Mead Bold font will show up in whatever ForeColor you have chosen. You can use whatever size and color and font you like. Express yourself. Experiment.