On 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 CUT, in the 3 dots icon at the top right, and after choosing the 2 points, open the menu again and choose "Stats between 2 marks".

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