QUESTION 1
I want to change the favicon icon (which is currently defaulting to the xampp favicon) to a different one. where should I place that favicon in openemr directory?
QUESTION 2
I want to place automatic signature in the prescription signature area. where should I place the signature image for that to work?
Actually, just stick your favicon under /htdocs/ and under openemr/sites/default and you are good to go. Just replace the one that is there. You can also do the same with the logo for the login, and adjust the banner area to fit it if you like. If you want, I will tag up a tutorial on modifying your look.