When your installed Dubb Chrome Extension is NOT showing at the top right of your browser, click the 3 dots at the top right portion of your browser, then select More Tools, and then Extensions.
or go to chrome://extensions/
Once you are on Chrome Extensions page, make sure that the blue switch is ON.
Once it is turned ON the Dubb, the Dubb Icon should show at the top right portion of your browser.
If you've done the steps above and it is still NOT showing, click the puzzle icon on the top right corner of the Chrome Browser, and pin the Dubb Chrome Extension.