Navigate to System administration > Security > Assign users to roles
Select the Purchasing Agent role.
Click the Manually assign / exclude users button
Select the Wayne Samuel Jorden user account and click the Assign to role button.
Click the Assign organizations button
Select the Grant access to specific organizations option
Select the USMF legal entity and click the Grant button.
Reference:
https://www.dynamics-tips.com/system-administration/security-roles