Application process - model release forms

You submit a signed model/property release form along with your assets.  If you lack signed release forms, don't submit those assets.  They will be rejected. 

See Stock Submission Requirements:  https://helpx.adobe.com/stock/contributor/help/submission-guidelines.html

Also read your Stock Contributor User Guide.  This is required knowledge.

• https://helpx.adobe.com/stock/contributor/help/reasons-for-content-rejection.html
• https://helpx.adobe.com/stock/contributor/help/quality-and-technical-issues.html
• https://helpx.adobe.com/stock/contributor/user-guide.html/stock/contributor/help/photography-illustrations.ug.html
• https://helpx.adobe.com/stock/how-to/tips-stock-image-acceptance.html
• https://helpx.adobe.com/stock/contributor/help/vector-requirements.html
• https://helpx.adobe.com/stock/contributor/help/generative-ai-content.html
• Model/Property Releases:
  https://helpx.adobe.com/stock/contributor/help/model-release.html
  https://helpx.adobe.com/stock/contributor/help/property-release.html

Welcome aboard!

There is no "application process" to become an Adobe Stock Contributor. If you meet the basic age requirement (18+) and submit a tax form, you can start submitting assets for review. Given your unfamiliarity with the process, it seems that you may not have read all of the info on the Learn & Support help pages. Read those to be sure you start off on a good footing.

Stock Contributor Learn & Support (adobe.com)

You will definitely need signed model releases. They can be downloaded from Adobe and, I believe, there are phone apps that contain model releases that a model can sign so that you always have one available in the field.

You always need release forms for people and intelectual property.