You probably can't if you're already saved.
Write on a piece of paper my soul and shred it to give it to the devil or just trade it for an ice cream. I personally wouldn't because you need it.
The Lighter Side
First, look in the classifieds for a bona fide "Soul Buyer".
Second, prepare your resume. List all the reasons your Soul would be a good (er, bad?) Soul to buy.
Third, send your resume to your own home address. "Soul Buyers" do make house calls.
Fourth, to prepare for your interview, you must have official testing by an exorcist. Only an exorcist can certify that you qualify to "Soul-sell".
Fifth, when contacted for an interview, you must follow certain rules, including: Wear black clothing (clothing covered in black mold would also do), paint your face red all over with clown make-up, show up late for the interview, and prepare to demonstrate at least 5 "small bad acts" during your interview. "Soul Buyers" do like to see "manners" as well.
Sixth, if rejected, beg for a second chance. If still rejected, count your blessings, get cleaned up, wash your hands before dinner, tell your family members you love them, enjoy your food, watch a movie or read a book for the evening, and be glad you didn't get the position. After all, a soul-less person is an empty person....and it wouldn't be fun at all to try to live the rest of your life as an empty person!
The end of "The Lighter Side".
you cannot do that, it is an impossibility no matter what you are being told
Yes, yes he did sell his soul.
No.
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No.