Mercury merge / delete feature branch

I’m trying to figure out how to use the Branch-per-feature approach in mercurial, but having created a branch for work and combined it with default, I cannot revert my changes back to my main repository. What is the best thing to do?

I created the Calibration Setup branch, did some work on this branch, and then merged it into a default value. Done with a few changes by default, and now I want to transfer this back to my main repository. But when I try, I get:

abort: push creates new remote branches: calibration setup!
Hint: use "hg push -new-branch" to create new remote branches

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