In Settings & billing → Workspace, set the workspace name, Company name (on PDFs), Company address (on PDFs) and upload a logo (PNG, JPEG or WebP, up to 2 MB).
You can also set them from a budget: Preview → Company & logo. A wide logo on a transparent background prints best.
If no company name is set, PDFs use the workspace name.
Not what you were looking for? Write to hello@actualsbudget.com.