As discussed in the answer to your previous question, if you wish to withdraw your paper from a journal, you will have to send a withdrawal request. You should mention the title of the paper and the manuscript id provided by the journal. Additionally, you should request a confirmation of withdrawal from the editor as the withdrawal process will be complete only after you receive the confirmation.
Here is a template for a withdrawal request:
Dear Mr. XXX [Editor's Name],
I would like to withdraw my manuscript titled XXXX [Title of paper] from further consideration by your journal. The manuscript ID is XXXX and the date of submission was XXXX.
Please confirm that the withdrawal process is complete. I apologize for any inconvenience caused.
XXXX [Your name and contact details]
You will also find this ebook useful:
A practical handbook of templates for communicating with the journal