To make use of the software in a container, you must first obtain an image of the container you need. This topic starts with a brief summary of the ways in which you can build a container image for yourself. But the main focus is on pre-built container images: how they are distributed through registries, and the procedures for pulling them so they can be used with Apptainer on HPC systems like Vista. Important related considerations, like managing the Apptainer cache, and getting the right architecture-specific build, are also covered.