GUI Texture disapears when I move it

Are you talking about game view or scene view? Note GUITextures live in Viewport coordinates. Viewport coordinates start with (0,0) in the lower left of the screen and go to (1,1) in the upper right, so for your x position and y position, the values need to be in the range 0 to 1. Try setting both to 0.5 to put it in the middle of the screen. If you need to see it in Scene view, 1) select it in the hierarchy, 2) hover your mouse somewhere over the scene window, and 3) type 'F' on the keyboard.