I was supposed to make a thread for this at the start since we do have some n00bs but here you go. Hopefully this will help you understand more
Head of Household
Every week, houseguests compete to become the Head of Household. The HOH nominates two houseguests for eviction. If one of the nominees is removed via the Power of Veto, the HOH will name a replacement nominee. The HOH reigns until the next eviction in which he or she may not vote except to break a tie. The houseguest may not participate in the following HOH competition unless it's the F3.
Power of Veto
Each week after the Head of Household has announced the week's nominees, the six Houseguests (the nominated contestants, the current HOH, and three other houseguests) compete for the Power of Veto. The winner of the Power of Veto can choose to veto one of the Head of Household's initial nominations. The winner is also protected from becoming a replacement nominee for the week. To determine who the three other houseguests are, we use the dice plugin.
Ceremonies
Nominations: The HOH nominates two houseguests for eviction.
Veto Ceremony: The veto winner decides whether to use the veto or not. If the veto is used, the HOH makes a replacement.
Eviction: After the veto ceremony, the nominees have 24 hours to campaign for votes. Houseguests will vote in their diary room, in a thread called 'Voting' or something like that.