Here is a simple wiki on how to use the Items Page!

When you first load up the items page. It may be empty. Make sure you are attached to the game before trying to use it. If still no, then click the refresh button next to the search bar.

Once its loaded, you will see a page full of items! Here you can search for anything in the game. It starts off by showing only vanilla items. But if you own the dlc you can change the Content filter, to be Vanilla + SoTE.

The number input at the top left, is how many of an item you want to spawn. Max is 999. To the right of that will be the pages, you can click the left and right arrows to go back and forward in the available pages.

The other filtering options are Item Type, Weapon Class, and Sort Order. Item Type and Weapon Class are ingame Categories to separate everything. Sort Order, is the order the items will appear when you are searching. Default is ClosestMatch.

You can Right Click on an item to Edit that item. This will give you a more advanced way of adding items, Specifically for Weapons.

On this page you can see you can select an Ash Of War for the item, which will appear next to the item image for whatever you have selected. As well as the infusion. Clicking Add will give you that item in game, with everything you specified. The middle Number Input is how many of that item you want. Max 100 for weapons 999 for others. You can hover over the Ash Of War icons and Infusion icons, to see what exactly they are in a tooltip.