Hi
Your panoramic image obviously will not have a 16:9 aspect ratio and so once loaded to the media list or placed onto the sequence track will have a chequered area at both top and bottom which is normal.
Start by clicking the FX button at the left end of the image on the sequence track.
In the Effects pane that comes up click the green cross and select Zoom. (You will have to zoom in to remove the chequered areas and then use zoom in animation to move along the image)
Click the Restraint box and select 16:9 to keep the zoomed clip in normal AR
Slide the red cursor to the start position for your pan (e.g.left hand end)
Open the keyframe pane (if not already open) and slide the red cursor to the left to indicate you are at the start of the clip.
The main Clip preview pane on the right will now show a rectangle with corner and side handles on your image clip. Pull the sides or ends to change the size of the rectangle and move it by dragging so that it displays the start area for your Pan.You may have to undock your preview pane (top right hand corner arrow) to adjust and see the position of the rectangle more easily.
Once in position click all four of the animation line buttons at the right of the effects panel.(Little graph lines with a dot on them) This will show horizontal lines for each parameter in thekeyframe space.
Now click the "Add keyframe to current postion" button..The green cross at top of keyframe panel. This will add small markers to each of the keyframe lines fixing the start rectangle.
Slide the cursor along to the end position for your pan (e.g. right hand end)
Grab your rectangle in the clip review pane and drag it to the end position for your pan. Dont alter its size -just position.
Click the green cross again to fix the keyframe (probably be already marked)
Close the effects panel
Play the image clip,It should now pan from left to right.
Alter the speed by dragging out the ends of the image clip to make it longer or alter the duration of the clip from the Storyboard option.
Nat