Install RustEdit > place the folders from the archive into your RustEdit folder > launch it and select your Rust installation folder > next, open the map file where you want to add the arena > in the editor, select the prefabs list > custom > there you will find the Bradley arena, just drag and drop it to the location where you want to place it. Once you have placed the arena on the map, you need to apply all the modifiers, such as Height, Splat, Topology, and Paths > save the map file with a new name, and after that you can run the map on your server. For everything to work properly, you must install the Oxide.Ext.RustEdit.dll extension. You can download RustEdit here: https://rusthq.com/product/rustedit-launcher