To suggest a swap, you must first enter your own swaps and needs, after saving your swaps you will see a list of potential swappers on the swaps page eg

   Potential swappers: (only visible to owner of book after first save)
   Click on a name below to start a swap check. Swappers appear if they have swaps available and  have their email field set. eg

   DEL TEBBIT-1 29   -   Mat Homes-1 15   -   Pip Kingsley-1 8 

When you click on the name, if you have amy matching swap, then you have the option to contact them, you will see the link below at the top of the swaps page.
         Send email to request a swap.

Click on that and an email will be sent to the swapper's address with a link to the swap details.

NB You do not get a copy of the email, as this would betray the email address.

NB The email contains your email address, so they can contact you if they like the swap.