how to import my .rar files to blender

Can't think of a good reason to do this. Do the .rars contain blender files, or some other interchange format such as .obj or .fbx? Just open those in blender - either by 'file open' or 'import'. Hope that helps.

Open .rar archive and then import from there files .fbx, .obj … formats

Follow these steps:
1. Extract the .rar file
2. Check the format of the files which are extracted from .rar file
3. Open blender and on the top left, click "file", then import, and then select the format

I usually use - CloudMounter. You can read this article and maybe it will help.
https://ftp-mac.com/how-to-open-rar-on-mac/