Hey there @111MaxD
Sorry for delayed reply
You can't directly rename or delete user presets from ANA 2's GUI. If you use the "Save As" option from the preset pan, you can rename an existing preset, but it will be duplicated inside your user folder, it won't rename & replace your existing preset. This is a safety when you want to edit already existing presets so that you don't mess with the original one.
In order to manage your user presets, best way is to go directly into your User Presets folder on your computer, you can access the location from ANA 2's Menu by clicking on Open User Preset Folder and then browse to the User Presets folder. From there you'll be able to add, delete, copy, rename your presets. Once done simply click on the Refresh button at the bottom of the Presets Browser window and your changes will be reflected.
Hope this helps