Login to your account and choose Go To My Account Page on the welcome modal.
Choose Invoice History from the left hand menu.
To download a single invoice you have two options.
Option #1 - Click the PDF icon next to the invoice number.
Option #2 - Click the three dots at the end of the invoice line item and then choose Download Pdf.
To download multiple invoices, first select the invoices you wish to download. Then under Actions choose Download PDF.
Helpful Hint #1:
Use the Search bar to search for a specific invoice number. Search function will not return partial matches.
Helpful Hint #2:
Use the filter functionality to find invoices by invoice number, order number, customer reference #, or date range.
Helpful Hint #3:
Make sure you're searching/filtering the correct date range!