Please tell me

when you click the book, there’s buttons where you rate and save the books to ‘want to read, already read’ Σ(っ°Д °;)っ

Click on the manhwa, and then scroll down a bit past the " Latest:
Chp.3 "
and then there should be a rating area right below it, with the stars and "already read/reading/want to read" thing. If u are currently reading something, click "reading", and u can basically add a rating if you'd like. And scroll a bit, there should be a box that is called "comment", and just type out whatever chapter u left off, and any notes u have for the manhwa ur reading.

I know about this but if I don't want to add in "want to read or reading" section, then how can I save basically I want to add in bookmark

Okkii !! Thank you so much

Go to any chapter of the manhwa that you want to save, click "≡", and click "bookmark it"

Afterwards you can see your bookmarked chapters when you go to the homepage and click "≡", then click bookmark

Thanks bro