Hi Mala, it can be difficult to do by selecting points because points are on potentially larger "underlying surfaces". There is some description of that here:
https://moi3d.com/faq#Q:_Why_does_show_points_work_for_some_objects_but_not_others.3F

So the general method is like Chri shows, you need to cut your object so that you have 3 parts, 2 end zones which can be moved and a middle zone that can be stretched or reconstructed between the ends.

- Michael