1. Click on the three dots in the upper right.
2. Click on "Settings", near the bottom.
3. Click on the three lines to the left of "Settings"
4. Scroll ALL the way down to click on "About Chrome"
5. In the middle of the page it will either say that Chrome is up to date, or start updating itself. If it starts updating, then you will need to click on "Relaunch" once it is finished updating.