Hello Imc,
Through trial and error we have found the most ideal size for Electronic Signatures to be 255 x 35 pixels or 2.66in x .37in.

Once you have added the signature for your user account from the user account configuration page of your Administrator Options you should be able to see your signature on printed letters and printed scripts. If you are unable to see your signature on those 2 items please contact Amazing Charts Technical Support by either emailing Techsupport@AmazingCharts.com, calling 1-866-382-5932, or coming into our chat support which is accessible from inside amazing Charts by clicking on Help>>>Get Live Support.

-Clayton@AC