Just screw the lid where you want it as is seen in Image 3 with 3 screws.
The reason for 3 screws is because if you use just one in the center the jar will spin.
I have seen people do that.
Now screw the Jar into the Lid and thats it. Oh, and put something in the jars.
Simple and easy, Image 4.
All the best from
James M Sandbrook.
12th of April, 2021.