You can send a statement to your billing customer in two ways.
Multiple jobs
If you would like to send a statement for multiple outstanding invoices across a number of jobs, select your billing customer from the customer list or use search.
Up in the top left corner you can choose to view, email or print a Summary of Activity for all of the invoices that are currently due:
Single job
If you want to send a statement for a particular job where you have sent out one or more invoices, click ⋮ options beside Create Invoice: