: Right-click the file or folder, select 7-Zip from the menu, and click "Add to archive..." . You can then choose your format (7z, ZIP, etc.) and compression level.
If this is related to (like Clo3D or Marvelous Designer) involving zippers or viral graphics: How to Compress a File Using 7-Zip viral3zip
If you are looking for a guide on how to use to compress or extract files, follow these standard steps: : Right-click the file or folder, select 7-Zip