How do you change the company name on the samsung er 4615?

You will need to use the character code table in the manual to work out each code for the characters. It's not too hard. Then you use the receipt message programming section to enter the codes.
If you don't have the manual with the character code table, one of our users has it here:

http://the-checkout-tech.com/manuals/cashregisters/Samsung_ER-4615_operating_programming_manual.html

Registerman
January 2013