How to get to the TooT PvP Custom Arena

Open the PvP Window (click crossed swords ⚔ icon in very top left)
On the left tab/sidebar of icons in the window, click the bottom one (looks like half a list and half a cog) with hover text “Game Browser”)
In the Search Owner/Name box “Bennish” and hit enter
Right click server and click “Add server to favourites”