Hi Dixi-Pixi,
 
You will need to contact your high school to see if they (and/or the school district) have a website that offers transcript ordering online. If the school is located in the United States and you don't have its contact info already handy, you can look it up in SchoolFinder:
http://www.education.com/schoolfinder/
 
I'm also including links below to some additional college-related resources you may find helpful.

The best way is to contact your school directly if its a college, but if its a high school u need to go directly to the schools Board of Education most websites have a request form.