Add an image to a plane in a prefab hdrp 2021.2.12

I have a prefab of a building and what I want to do is add a "sign" to the building so the player will know what kind of a place it is. I took my prefab and added a plane to it, but how do I add the image to the plane? I've tried setting the image to 2d, to 3d. Apparently you can no longer simply add an image as before in the tiling/offset. I don't see any place that it can be added, so what am I missing? Please be advised the prefab is a 3d model and the image is a jpg.

First question: How do I prepare the image to make it compatible with a texture.

Second question: How do I then add the image to a new material.

Third question: How do I then add the texture to the plane on the prefab.

The HDRP is all new to me, so walk me through the process please. Thanks!