Does anyone know how to merge in Git?

I am working on a time limit in Python.I already finished and put it in the branche time limit as you can see above in Current branch, but i want to merge it than in ‘development’ as you can see in the list. But how to does this?
Anybody a idea or clue?

  1. To merge use “git merge”

  2. To push to different branches, try setting the head branch to something else (I’ll give cmd later because im on a phone right now)