The first thing to know is in order for you accept the mark of the beast, many things have to happen first.
During your lifetime you will have to not accept Jesus as your personal Lord and Savior, which is the only way to avoid the judgment of the Lord.
“That if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved.” Romans 10:9
You will have to miss the rapture, experience the initial plagues of the tribulation, not accept Christ during the tribulation and NOT accept the mark of the beast or not worship the beast..
“But I would not have you to be ignorant, brethren, concerning them which are asleep, that ye sorrow not, even as others which have no hope. For if we believe that Jesus died and rose again, even so them also which sleep in Jesus will God bring with him. For this we say unto you by the word of the Lord, that we which are alive and remain unto the coming of the Lord shall not prevent them which are asleep. For the Lord himself shall descend from heaven with a shout, with the voice of the archangel, and with the trump of God: and the dead in Christ shall rise first: Then we which are alive and remain shall be caught up together with them in the clouds, to meet the Lord in the air: and so shall we ever be with the Lord. Wherefore comfort one another with these words.” 1 Thessalonians 4:13-18
“And he had power to give life unto the image of the beast, that the image of the beast should both speak, and cause that as many as would not worship the image of the beast should be killed. And he causeth all, both small and great, rich and poor, free and bond, to receive a mark in their right hand, or in their foreheads: And that no man might buy or sell, save he that had the mark, or the name of the beast, or the number of his name. Here is wisdom. Let him that hath understanding count the number of the beast: for it is the number of a man; and his number is Six hundred threescore and six.” Revelation 13:15-18
To accept Christ is to AVOID all this, which can be done with your words as simple as this.. Lord I repent of my sins, come into my heart, I make you my Lord and Savior!
Knowing this, be comforted.. you will never see the day of the mark of the beast.
“Because thou hast kept the word of my patience, I also will keep thee from the hour of temptation, which shall come upon all the world, to try them that dwell upon the earth.”Revelation 3:10