To get started, navigate to Customers -> Export customers.
Erply will allow you to narrow down your export, if necessary. You can limit this information by customer group, customer country, etc.
This step can be helpful if you only need to view/edit groups of customers rather than your entire customer database.
Once you're ready, hit Export to download your customer data as a.XLS file.
The .XLS file can be opened and modified in a spreadsheet editing software.