Your frames will be labelled with pencil inside each corner, so you can lay them out of the floor ready for assembly. The hinged frames will always be your left and right sides and if you do have any T-Posts you can lay them in position.
The corners are mitred and will have hoffman keys fitted. Slide all four corners together.
If you have a T-Post, you’ll find a predrilled hole in the top and bottom frames, you can feed a screw through and line it up with the predrilled hole in the T-Post.
Complete this process with any remaining T-Post fixing points, then your frame is ready to install on the window.
It helps if you drill a pilot hole while the frame is still laying flat and start a screw to suit your application.