- How ever did she manage to get the job?
You can remove ever and the sentence will still make sense.
- How did she manage to get the job?
Some grammarians believe that how ever has the same meaning as how on earth.
- How ever did this happen? = How on earth did this happen?
However is used to show how a sentence is related to what has already been said.
- Some of us want a new system. However, not everybody agrees.
- Gold prices have been rising. However, this trend is unlikely to continue.
- I was not feeling very well. However, I went to work.
However can also mean in whatever manner.
- You may decorate the room however you want. (= You may decorate the room in whatever manner you like.)