I need to cut off a certain part from a mesh, and I heard that you can do it in some edit mode. I have no idea how to open it, though. It said on a youtube video to press tab, but it did nothing. It’s supposed to open something like this: 
when you click the tab thing and then this: 
[deselect vertices or something like that]. Can someone help?
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Pressing Tab to go into Edit Mode only works on the object you have selected curretly, so in this case you’d need to select the sphere in Object mode (with right click in Blender 2.7 and before).
All of the vertices will be unselected by default, pressing A will select all of the vertices of the currently selected object in Edit mode. (not vertices of other objects in the scene)
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