Example
- Go to the repository, e.g.: https://bitbucket.org/username/repo_name/
- On the left menu, choose branches
![enter image description here](https://i.stack.imgur.com/cwgci.png)
- On the right side of the branches page, select Create branch
![enter image description here](https://i.stack.imgur.com/LjsKe.png)
- A popup window will appear, select Branch from and enter the new branch you want to create in the Branch name textbox
- Click create
A new branch will be created