Blaze menu is available in 3d view, as soon as you install the add-on and enable it, the Blaze menu is visible on the top bar in the 3d view.
Upon clicking on Blaze in the menu, you should see a dropdown consisting of 3 options -
Add Blaze Shader (Mantaflow)
Add Blaze Shader (VDB Volume)
Add Blaze Shader (Only Smoke)
Blaze panel is available in Node editor, The panel was also present in physics Tab in earlier versions of this add-on, but lately, this add-on was removed from multiple places, and in the latest version, the add-on is only available in the node editor.
To be able to see the panel in the node editor, just press the Shortcut key 'N' on your keyboard, while your cursor is in the node editor.
When you open the properties panel, the first thing that is visible is a 'Preset Dropdown', and by default, the new blaze shader is chosen
There are a total of two presets in this dropdown
1. New blaze shader
2. Old Blaze Shader
Below, are the two buttons, each for Mantaflow and VDB Volume Shader, based on your choice in the dropdown, the shader will be added when you click those buttons, but if you add the shader from the Menu in 3D view, as the New blaze Shader is chosen by default, the same will be added, but if you change it in the dropdown here and then if you add the shader from the menu in 3d view it will add based on your choice in the 3d view.
"Add Blaze Shader (Mantaflow)" can only be added for Mesh objects, and thus automatically disabled only if you have selected any other object then mesh by mistake.
The same applies to "Add Blaze Shader (VDB Volume)", this can only be clicked if the selected object is a VDB Volume.
And for the "Add Blaze Shader (Only Smoke)" button, it can be applied to both Mesh and VDB Volume.
Note:- Blaze Shader (Mantaflow) should be applied only to the domain object in order to see the correct results
Change attribute panel
Here, you can update the flame attribute, though you do not need to do it in case if you are using Mantaflow, but still if are willing to try some other attributes
2. flame(applied by default)
and the valid attributes for VDB volume are:-
Though Houdini also can export fuel attribute, it is not very good to work with this attribute in the blender, that's why it is not available to enter in the custom attribute panel and considered as an invalid attribute. After every time you enter the attribute, you need to click on the "Update attribute" button, just below it to see the results for the following attribute