Hi @LUISFERNANDEZD ,
On top of the information provided to you from @Chris_Hofer , if you use a free canvas account you can reach out to canvas support and request they delete your account. Do understand after any account deletion you will likely lose access to everything, so ensure you download and keep any important information/data you'd like before you actually have your account deleted.
If your school pays for canvas like Chris mentioned above, then you may want to consider reaching out to your school's I.T. or administration, as they would likely be the ones managing your school's canvas instance.
Thanks!
Noah