Click with the left mouse button close to the region:
![Image](GetFile.aspx?File=Tutorials/formatting regions/select1.png)
drag to the opposite corner until the region turns into blue:
![Image](GetFile.aspx?File=Tutorials/formatting regions/select2.png)
Release the mouse button:
![Image](GetFile.aspx?File=Tutorials/formatting regions/select3.png)
The same is for selecting multiple adjacent regions:
![Image](GetFile.aspx?File=Tutorials/formatting regions/multipleselect1.png)
If you want to select not adjacent regions, just select the fist one and the subsequent ones add by pressing (and kepping) CTRL button. Then with the left mouse button add the regions of interest.
![Image](GetFile.aspx?File=Tutorials/formatting regions/multipleselect2.png)