Please, for the love of god, please don’t be this person. No matter how long it’s been since an update, no matter how many unfinished stories are sitting on their account, no matter what - do not be this person.
Not only is it insanely rude, but you also do more damage than you think be being such a self-entitled ass about something someone created for free and for fun. “This author” can see what you say.
For context, this is the third video in a series. The first showed users how to create a theme based on their user ID number, used as the hex colour for the header. A second video (not posted to tumblr), showed how to add the Reversi (dark mode) skin as a parent.
Steps not shown in this video:
After logging in, click on your username at the top of the page. Click on Dashboard. Click on Skins. Click on Create Site Skin. Click on Wizard. Scroll down to the section called Colors.
Video description: This is an AO3 tutorial for creating a customized dark mode skin (medium difficulty level). The narrator has a female voice, and she's demonstrating the steps as she shows them on the screen. At the end of the video, you can see the dark mode version that she has created.
Google "hex color". This will provide you with a hex color picker that you can use to find the colours that you like.
Select a dark colour for the background of the site. She chose a dark blue/grey.
Copy the six-digit letter/number combination under the word Hex. Hers was #272a2e. Make sure that you copy the # as well.
Paste that number into the skin wizard in both the Background and Accent color fields.
Go back to the color picker and choose a lighter colour for the text. She chose #bacad9
Paste that into the skin wizard in the Text field.
Go back to the color picker and choose a third colour that will be used as the text colour for fic titles as well as for the header and footer on the site. She chose #4898e8
Make sure that you have a # at the start of all four of your hex colour fields.
Make sure that your skin has a title (otherwise it won't save).