The Working with Layers tutorial section does not describe how to connect through hole vias to different plane/signal layers in a 4 layer board. You need better documentation or a YouTube video showing a real example of how to do this. I doubt I am the only one confused on how to do this.
Hi Jack. FYI, I am not affiliated with Novarm/DipTrace. As to connecting copper pours, make sure the via is connected to the desired net and that the pour is connected to the same net. For more information on connecting the pour, open the tutorial. In the "Bookmarks" panel click on "Designing a PCB", then click on "Copper pour" and skip to the section titled "Connect copper pour" (near the bottom of page 66 in DipTrace version 4.2.0.1). Here's a generic example of what one might see when connecting a copper pour...