In order to create a new visualization, the query must be Saved. If you didn't save the query in advance, when you start creating the visualization, the query will be saved automatically.

To create a new visualization, press the +New Visualization button:

After clicking on +New Visualization, you will enter the Create Visualization menu, which will be covered in detail for every chart type in the following sections:

In order to edit a visualization, first, you must locate the query of that visualization and enter it (usually, it's enough to simply click the query link).

After finding your desired query and clicking on its link, you should get the following options:

In order to add a new visualization, you first have to click on the Edit Source button (top right) to enter into edit query mode, which allows you to add new visualizations, like we saw previously.

In order to edit an existing visualization, click on the Edit Visualization button.