catia imagine and shape

i'm new in imagine and shape workbench. I want to modify this triangular surface but I cannot. I'm supposed to pick a point and pull it but its impossible. need help badly. thanks

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2 Answers

1st maybe you have selected the affinity tool try switching to the translation (ctrl shift t)
2nd if you are unable to select the points try fliping the surface for example if you are trying to select the points in the front face then switch it to back face and then modify it
try these methods if still have doubt i shall upload a video

 
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