Hmmmm....about that I recommend you to contact the service team of webnovel and they will review your book if it was qualified. If it has good numbers of view, word count, etc. (Remember that not all who wanted to be contracted were given a contract.)
They will then notify you at system notification. Sending you a mail on gmail and a link for the contract(PDF) to be downloaded and to be filled with infos about your book and yourself. It made me pass the contract to the inkstone and wallah! Done! But I made mistakes so I corrected my mistakes and passed again.
After you are contracted, you will be given an editor chatting portion on your inkstone and chat them that you want to lock your chapters. They will give you a link and fill it up. (To what chapter you will lock your novel)
Warning!
Remember that after you are contracted and your book is premium, you need to be dedicated to write for four months. Writing 1500 words per chapter every single day for a month will give you 200 dollars per month for 4 months. It is called Minimum guarantee system. Missing an update even once will make goodbye to 200 dollars. After four months, your book were on your own and you will have the actual revenue of the novel itself.
Well have a nice day!