If you (here "Joe Doe") have opened a bug report and then the bug is (supposed to be) fixed, you have to test, then Resolveit. So developer will set the task to Review and assign it "back to you" (Joe Doe in the example).
Then the next steps for you (the one who opened the bug) will be:
- you test if the problem is gone
- if OK, Resolve the task (and we are done here)
- if still a problem, set to Unsatisfactory and assign it back to the developer (Ralf Thorn in the example).