>>If there are bends and no junctions at the vertical section of a pipe. Then ?<<
Then you will not be able to report the pressure, HGL, etc at the desired elevations. You'll need to insert a junction at the bend points.
>>Please could you tell me where to enter those elevation points I did choose the 'true' option .But from there i don't know how to proceed. Please help me. :)<<
The elevations are entered in the nodes (such as junctions, hydrants, tanks), not the pipes. At any point along the pipe where you want to report pressure, etc, you will need to insert a junction and enter the elevation. See attached.