What is it that you're aiming to do by adding the word "Discount" to the address field? Why do you have City and State in an address field? Right off the bat, this doesn't seem like an efficient way to do this...
Nevertheless, what is your criteria for adding the word "Discount" to the end of the field? If you want to add the word Discount to all address fields that have "OH Cleveland" as values:
update <your_table>
set address = concat(address, ' ', 'Discount')
where address = 'OH Cleveland'
If you want to add it to all fields, drop the where clause.