Hey, Dez! I can't believe you're applying for colleges, it's scary to think those born in 1996 are now high school seniors.
I agree with Sara, you should send it directly to the college admissions office yourself. Don't do it through the school. They should have the address listed on the college's website.
When I applied for proper admission back in July, I did exactly what was listed on the college's website. As for transcripts, you can attach it to your admission request or have your current school do it. But it's best you send the high school transcript to them yourself. I did that with my high school transcript.