Click "Add Step"
Select "Branch Step" from the drop-down
To rename the branch, just click there and type
You can add a new branch from here
Select a rule from here
Select the desired option
Select an operator from here which will satisfy the condition of the URL that was auto-populated
Add a new rule from here
You can delete the rule from here
Click the ellipsis to view more options
Select from "Edit" and "Delete"
When you hover over the branch line, "Add Step" option appears, click it
You can select from the options available and you can again choose "Branch Step" and create another branch like that
Here is an example of a very complex guide created using Branching!