Mouse usage in Emacs by default is different than it is in other applications, and it can be confusing for an EmacsNewbie.
You can use the mouse as usual:
‘mouse-1’(left mouse button) and drag to define the selection (“region”).
‘mouse-2’(center mouse button, or left and right buttons together, if you have no center button) to paste.
‘mouse-3’(right mouse button) to extend the selection or pop up a context-appropriate menu, depending on the current buffer.
Check the EmacsManual to learn about additional available mouse actions. In particular:
‘mouse-3’twice in the same spot to cut (“kill”) the selection.
‘M-’) during mouse actions. For example,
‘M-’while dragging creates and extends the secondary selection;
‘M-mouse-2’(that is, click
‘mouse-2’with Meta pressed) to paste the secondary selection.
You can set point by clicking
‘mouse-1’ or using the arrow keys. You can set the mark in any of these ways:
‘C-SPC’(point stays where it was)
‘mouse-1’(old point becomes the mark)
‘mouse-3’(becomes the point; old point becomes the mark)
If you define the region without using the mouse, it may be invisible; you can make it visible via
‘C-x C-x’, which also swaps the point and the mark.