Pop-quiz freature

Received the Rocket Fuel, the Rocket French bulletin on 9/29/2016. Awesome newsletter that I enjoy receiving. In this version there was a reference to pop-quiz, in its section "Time for a pop-quiz!"

The direction it provides is: "From the Dashboard just go into any lesson and click the 'tick' icon at the top of the page. This will take you to the Quiz section, the place where you can test your understanding of all that you've learned."

I can't find where to find this 'tick' to use this pop-quiz feature. Can anyone clarify?
Qu'est-ce que c'est 'tick'? Je ne sais pas!
Merci!

I hadn't previously heard the expression 'tick icon' either.  At the top right corner of each lesson are 3 to 5 grey-coloured icons:  a headset, pencil, light bulb, etc.  These must be called tick icons.  Click any one of them with the mouse to go to that particular test.  When the test is completed, the icon turns to one of the 5 rating colours.

The English sentences and vocabulary in RF sometimes show the influence of British English, rather than American and/or Canadian English.  I suspect tick icon is one of those situations.