Click Change Level to adjust your level to your T.I.T.A.N. save. Click Delete Item to delete an item from the inventory. The catalogue is the bottom left button. When clicked, it will open up an index of all items. Click on one twice to add it to your inventory. Click the insurance to change how many credits DEATHTOLL is reduced by. Items will be removed if the level is decreased after inputting higher level items.
If you're curious how many credits you'd have to pay if you died in the game, you can check here. Note: Not an actual death toll. Literally a variable name in the code. Credit to @griffpatch for text engine.