[question] How to manually add a non-listed tag?

[ruSauron]

How to add non-listed tag? Especially if the tag is both missing from the list and part of another tag. For example, I tried to add "shio".
Now the best solution I've found is to write two __ characters in front of your tag name, for example, "__shio". Then it will definitely not be in the search list and the program will offer to add it.
And how do I remove a custom tag from the list that is no longer needed or has a typo? Besides editing the danbooru.csv file in notepad