What do I need in order to execute a real-time wireless upload?

In order for you to set up a real-time wireless upload workflow as a photographer, you must have:

1. A Library Staff (Admin/Editor) user seat on a PhotoShelter for Brands account

This is the "how", or, the way image files will move from the creation source into the PhotoShelter for Brands account.
This device could be your camera, laptop, tablet, etc.
Some digital cameras have built-in WiFi capability. Other devices need a wireless transmitter: an add-on piece sold separately from the camera body. Refer back to the instruction booklet which came with your camera, or, search the Internet for your camera make and model plus the phrase “ftp upload” or “wireless upload”. The camera’s instruction manual is the best resource for accurate wireless transmission configuration advice.
If you face a slow connection or difficulty connecting to the venue’s WiFi, we recommend troubleshooting with the IT team responsible for that wireless connection in the venue. We do not recommend using a mobile hotspot for a real-time workflow with large batches of files because the network speed of such a device might limit you to uploading one or two select files at a time.

This is how PhotoShelter for Brands knows "where" to deposit the files you will upload wirelessly to the right location in the PhotoShelter for Brands Library.
Incoming FTP is the only upload method which lets the owner (Admin/Editor) of a PhotoShelter for Brands account control where your uploads land within PhotoShelter for Brands Library.

Map out the steps of the workflow beforehand on a sheet of paper or in a Google Doc so that everyone involved is clear what they must do and what they can expect.
Ease concerns on all sides by practicing your workflow from image capture to image delivery before a big event.
Spare batteries and chargers are also recommended. Connecting a camera or mobile device to a wireless network will drain batteries quickly.