Hi,
Here is how to rotate a part:
1. Start the Hierarchy Editor and make sure Highlight Selected is checked. Find the part in the left pane (outlined in blue below). It will turn red. If it doesn't turn red, you haven't selected the correct part.
2. Right click the #Transformation word and choose Add Transformation.
View attachment 73462
Now right click the resulting Transformation word and choose Edit Transformation:
View attachment 73461
Now in the Editor that pops up, change the value in the X Rotation box. Positive is the direction you want (in this model, yours may be different?). I used 6 here.
View attachment 73460
The result is that the rear of the nacelle has been rotated upward.
View attachment 73459
You can also edit the Y Transformation number to move the object up and down.
You cannot see the movement as you enter the numbers, you will have to use trial and error.
Hope this helps,