I´ll assume you are trying to add a new mesh ... and your "mouse" (where you want the new mesh to be created) is not where you want it ... (it is too far away)
(your "mouse" is called "cursor" in Blender)
1) Select an object close to where you want the "mouse" to be
2) ... Object/Snap/Cursor -> Selection

- cursor.jpg (40.35 KiB) Viewed 1928 times
your "mouse" will then snap to the object
centre of the object you selected ...
(If this is
not your problem ... please, could you explain more ...)
you may also be having "clippping" issues ... make sure you set the clipping to a high number (e.g. 10, 000) ... the default in Blender is only 500
1) Click View/ View properties ...

- clip.jpg (43.09 KiB) Viewed 1927 times