Addon is located on the N-Panel, All you Need to do is

Select Desired Preset Then, Use The Pavement Road Preset as a startup for your Custom Roads like Mud Grounds

Use the Mud Road for Your Roads with Transparent Alpha Channel

Click Draw Road, to go in Edit Mode, Draw the path you want and the selected preset road will be drawn

Click Draw Mode to go to the Drawing Mode of the Selected Path

Click Add Road if you just want to add another road To Draw on with Edit Mode

Make Custom Road or Path

To make your Own Road Using your Own Textures, Select a Preset that corresponds to the kind of Road or path you want to Draw, Goto Custom Tab ontop and play with the Image Base Color, Normal, Roughness and Displacement by Browsing your own Texture and the rest shall be done for you