Just asked uncle Google and found this:
https://www.khyam.co.uk/image/products/instructions/203008.pdf
Item two states:
- Quote :
- Pull out the fabric of the awning so that the sewn in groundsheet is flat and free from creases or folds. Then securely peg the four corners. Please remember that you may need to reposition the corner pegs after inflation.
Don't know about stopping the air coming out, but the pics in the attached link show a pin that you push in to release the air which acts as a one-way valve when blowing up.
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