It’s under the ozcard members part mate, from there it should be fairly easy.
You enter the name(s) of the members your trading with and what the deal is , then the buyer or seller agrees to the trade which is then active.
My 2 cents.
The only knock is the scratched signatures.
Apart from the scratches on the sigs, the signature cards look very classy with the faded look. I like how they have done different versions of both signature and rookie cards, the rookie cards #115 will be more sought after in years...