Logging data to Exosite portal without ethernet shield

I am logging data using an Arduino and I would like to upload the data to my Exosite portal. I have seen two examples where it involves the use of an ethernet shield:

arduino_http_post

cloud_read_write GitHub - exosite-garage/arduino_exosite_library: Arduino library for Exosite IoT Platform

I do not have an ethernet shield. I want to upload to the portal by using my Arduino connected via USB to an internet-connected PC.

Is there any method for doing this?

Any help would but very much appreciated