You can either select the "Center" bone, then click "box select" and click and drag a box around the entire model and then select "Move". Then you should be able to move your model around the screen ^w^
Another way *depending on the model your using* is to select the bone between the models feet *sometimes called a "Master Bone"* and click move and the whole model will move with it.
Hope this helped ^ u ^
To move the model without the buttons in the corner simply select the bone you want to move and in 'Bone Manipulation' box select either 'rotate' or 'move'. A control will appear over the bone you selected and you just click on the different coloured lines to move the bone.
Camera movements with a mouse:
Left click(hold): Will rotate the camera
Centre scroll button(scroll): will zoom in.
Centre scroll button(click and hold): will move the position of the camera around the screen.
Hope this helped ^w^