How do you convince them to what?
If what you want is something that a reasonable person would allow, then you might try pointing that out, along with reasons your parents should let you ... whatever it is you want.
However, ultimately, the decision is theirs. Once you're 18 you no longer have to care what their opinion is (assuming you're not living with them), but until then it doesn't matter how much you want something, if your parents say no you don't get it (with some exceptions ... if your parents are actually abusive the government may intervene, so if what you want is "enough food not to starve to death" or "not to have to live in the closet" then there may be some help for you).
You cant convince your parent's because they have a good IQ your parents not be tricked by anyone.
The best way to talk to your parents is honestly and openly. If you tell them your in love and be honest they will likely respect you choice.
Honestly, you can't convince them. Either they will let you or they won't.
The best way to convince your parents to get you a music computer is to first explain to them what it is and what it does. Then explain to them how if fits into your goals and your interests.
tell them
How do I convince my parents to move my family to LA
you say parents are going with
Convince them about all the great things and new challenges you will face . Maybe convince them about what their intrests are .
lololol
get a job
tell them ur tired
jk;.i;hopi