I need a bank letter with my ACH account info to give to a client. where can i find that?

Welcome to the Community forum, @jenbat1. 

The option to obtain ACH account information isn't available in QuickBooks Online (QBO). I'd recommend reaching out to your bank, where ACH is connected to obtain the necessary account information. 

Additionally, if you wish to link your bank account and credit card accounts automatically to QBO, check out this article for detailed instructions: Connect bank and credit card accounts to QuickBooks Online. 

If you have other questions or concerns within QuickBooks, please leave a comment below. Our team is always ready to help. Have a good one.