Query on photoshop software 2021 version in wacom one tab windows 11 laptop

Hey Everyone. I got stuck in this particular question where I want to save a custom pallate but I'm not able to do that because of some glitch Ig. So could you please guide me step by step on how do I do that I have successfully created a folder and after adding the single color, rest of the colors i am unable to add it. So could u plz guide me step by step how do I do that. I have only this particular pallate in swatches. So I want to add the custom Colors in the swatches in a specific group. So how do I do that? I'm a complete beginner and can't upgrade my software to the latest 1s. So could u plz guide me step by step on how do I do that in photoshop 2021 version in wacom one tab in windows 11 laptop. I'm unable to share the pic so basically I have only swatches tab at the moment in my software. So please guide me accordingly n also u can share the pics/ screenshots accordingly