Chromebooks do not ship with Acrobat Pro. The practical answer to how to edit a PDF on Chromebook is a browser-based PDF editor that runs in Chrome.
Open PDFCAN in Chrome, upload the PDF from Files or Drive (download first if needed), edit text or sign, then export back to Downloads or Drive.
Chromebook tips: use an external mouse for precise text selection; for signatures, a trackpad draw works, or upload a signature image you keep in Drive.
No Android APK required for basic edits. A free online editor avoids sideloading and keeps the workflow in Chrome OS.
Free limits match other platforms: 10 PDFs/day, 100 pages, watermark-free export.