If you could describe the problems you post on this forum with a few words along with images it would be easier to give you directions.
Only based on what I see in the image, it seems like you are trying to add a coincident relation between the endpoints of a straight midpoint line and an angled line. I guess that your dimensions and existing relations are locking the lines so they are unable to extend to the common point in the corner. A good practice when sketching in SolidWorks is to first draw the closed contour in the desired shape, with relations. Then add dimensions to set the size of your shape. In your case, delete 2.01 dimension and add the coincident relation on the endpoint.
If this is not the case, please give a better description of your issue.
Hope this helps
Eshraq, it seems quite obvious to me that your problem is the toolbox that is pinned to the right hand side of your display...
Present in a way that mentor can easily grasp the problem then only precise and quick answer is possible.
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