This week's rituals focus on body marking and writing. You bear a submissive mark to reinforce your self identity and how you present yourself to others. The idea is to prepare for wearing a permanent collar.
This one I have no problem with. I wear a permanent collar, and I think drawing on sharpie for a month is good practice for any permanent change.
My collar has a symbol that we both identify as belonging to my wife. For the next week she wants to draw that symbol on me as well. I'll be wearing it under clothes because I'm not out.
Pro tip: If you're going to permanently adorn yourself with some icon, make sure that icon doesn't have sharp edges. I can't tell you the number of times I've accidentally gauged myself with the symbol since I've been permanently collared.