Firstly please install the add-on.
After you have installed the add-on you have to switch into Edit Mode and add the „Counter Up“ block element to your page. You will find this block element under the „Multimedia“-section.
Once you have add this to your site a settings popup will be apear. In the first tab of the popup you can add multiple timers into the block by clicking on „Add Item“. You have to enter a counter value and a description for each counter item. In the second tab you can define the colors and the duration time. The time unit are ms (mili-seconds; 1000 ms = 1 second).
When you're finished click on save, leave the edit mode and you will see the final result.