After you have provided accurate basic information about your work, a prompt will appear that reads Add a model or crew member:

Step 1: Start typing names
Choose names from the provided list of people with Models.com pages. If the crew or model does not have a Models.com page, they will not be able to be credited.
If the photographer does not have a page, add their name to the title of the work for proper credit.
If you have a page on Models.com as an artist or a model, you will notice that you have automatically been tagged.

Step 2: Click done.
You will next be prompted to upload images.