Open Squeekboard (aka keyboard).
Click on the globe key.
Switch to Terminal view.
Click on the >_ key.
Tab is next to Esc key.
P.S. Menu key opens copy/paste options.
P.P.S. If you use any of the sticky keys (e.g. Ctrl), remember to unstick them after you use them, or the keyboard will not type correctly.
Edit: Squeekboard languages: Squeekboard release 1.10.0 - #5 by dcz
(That will also take you to the Settings, where you could just select more languages directly in the Regions & Language section.)