I want to know the answer to the following question:
What can a wrestler do to show a willing submission?
All the background I'm provided with is that "Also, since Ken Shamrock (a legitimate UFC competitor in its early days) popularized it in 1997, a wrestler can indicate a voluntary submission by "tapping out", that is, tapping a free hand against the mat or against an opponent.". Is that enough to answer the question?
Answer: yes