Student or Learner
I was wandering about this sentence:
I will post the last because I would like to see your reviews first.
So the intention here is to let all other people to post a comment on a forum and, after I check everything, I intend to add a comment of my own.
So is this form I will post the last correct or I have to use something else?
I would use "I will post last ...". There is no need for the definite article. Someone will post first, someone else will post second, third etc and you will post last.
Note my other amendments to your post. You were "wondering", not "wandering". After "let", don't use "to".
I will let you do it. (Not "I will let you to do it.")
He will let me eat. (He will let me to eat.")
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.