Sign in at the Start of Devouring Body

First of all, the realm is not detailed. After watching it for a while, I felt that it was really bad. There is also a system that says it is a sign-in system but does not say how to sign in. Does it require a special place or can it be done every day? As for the protagonist, the training process is not detailed and the jump is too big😌. It also does not pave the way for the later stage. Anyway, I can't understand it.

Newcomer, I hope you all like it😊