To create a flow, navigate to the "flows" tab and click the "Create Flow" button:

The "Create Flow" dialogue will appear, where you can:

1. give the flow a name
2. assign it keyword triggers
3. specify how long inactive contacts will remain in the flow before being removed
4. select the type of flow you'd like to create
5. set the language in which you'll edit it 

Once you've assigned your flow the proper attributes click the "Create" button to enter the flow editor.

Note that when building a flow, we recommend prioritizing vertical movement over horizontal movement. The flow editor is designed to support horizontal movement to a point, but will support vertical movement indefinitely.