Follow the requirements over here Btw you wouldn't be a mod just letting you know now. You need to be on skyblock for at least 2 weeks.
Step 1. Get Donor250 or Donor400 Step 2. Be really toxic Step 3. Apply for mod Step 4. Watch yourself get promoted. a_waffle - Credit to him
You need to make a serious application to be moderator. However, I encourage you to read the requirements and get to know the community first.