In the Activity page, you can select 2 points and see the statistics between them. You can see your Average speed, Distance, Max speed, etc.

To activate it, click on TRIM, in the 3 dots icon at the top right, then move the slider tool and choose the section you ar interested in, open the menu in the little dots on top of the Slider, and choose "Stats between 2 marks".

You can refer also to this article, while explaining how to TRIM, it shows how to select and move points on the map: https://waterspeed.helpcrunch.com/v2/knowledge-base/articles/46