1. Download this repository and unzip it
2. Open your Chrome extensions page
3. If not already on, enable Developer Mode by clicking the toggle switch next to Developer mode
4. Click the LOAD UNPACKED button. Select this extension directory from step 1.

You should be prompted to generate an auth code from your Remarkable account. Once you've done that, try printing a page! If you don't immediately see the Remarklater printed listed in the Print dialog, click the dropdown under Destination and click See more…

• https://github.com/splitbrain/ReMarkableAPI/wiki/Authentication
• https://github.com/juruen/rmapi

More resources on the awesome-reMarkable wiki