This question is in reference to Atlassian Documentation: Managing project role memberships
How do I set user project roles
With the release of JIRA 7, the way you manage access to applications and roles has changed a bit.
If you wish to grant certain group/user a role of any project, you need to go to the Project Administration:
Feel free to watch this related call to user roles:
https://jira.atlassian.com/browse/ID-283
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