How do I change my roles?
2 answers
Role assignments are changed in the members section of the overview tab of the project area or team area editors, in both the web UI and the Eclipse client. To change someone's role assignments, you have to be a project administrator or you have to have permission to save the project area or team area. (There are several specific permissions underneath the more general save. I assume the permission that you need is "Modify the collection of team members," but I'm not sure if that is only for adding and removing users or if it also applies to changing the roles of existing users.) You don't have any special permission to change your own roles. Someone who can change the project area or team area has to do that for you. (Because if you could change your own roles, you could give yourself lots of extra permissions by adding roles that should be kept restricted.)
Your product owner probably has permission to change your roles. That's the type of thing that product owners often do. But it's not guaranteed. It depends on how your project is configured.