how to get the bitcoin address for one exchange, so i can send bitcoin from another exchange
OK, I can’t be specific as I don’t know which exchange you’re using, but you need to search the destination exchange for a tab or menu item called something like “Deposit” or “Funding.” It might be nested under something else, like “Account” or “Balance.”
Once you find it (the exchange’s help section should make it clear how to find your deposit address), then select an option like “deposit Bitcoin.” An address (or a button to generate a new address) will appear. You then enter this address into the withdrawal function on the exchange you’re sending funds from.
That’s the process in a nutshell, for any further details consult the FAQ or Help section on the relevant exchange.