Go to the auctioneer behind edgeville bank or at Jolly Bear Inn on Varrock Border

Talk to auctioneer, choose option 1

Select ''My listings''. In the ''sell tab'' you will see everything in your inventory. In the ''buy tab'' you can search for any item in game and make a listing for how many of the item you need and how much you want to pay per item. At which point the other person clicks the ''sell items'' tab, finds your listing and sell it to you.

Talk to auctiooner, option 2 to collect your items

nice thank you, this deadman thing just got a lot better

Cool np. It's good fun. I forgot to mention though that using the Auctioneer at the Jolly Bear Inn in Varrock is NOT safe, someone could attack you there however Edgeville is a safezone and nobody can attack you there. Just remember not to enter a safezone while you have a skull above your head or the guards will wreck you

Good luck!