My guitar goes out of tune really quickly.?!

My guitar goes out of tune really quickly.?

Whenever I tune my guitar, whenever I finish tuning, all the strings except the last 2 I tuned go out of tune. How do I solve this???

1 week ago
It's an electric guitar.
My friend has the same exact guitar.
It's a Squier that I got from Guitar Center.

1 week ago
OK, I'll post another question.
And I just got this guitar 3 hours ago.
How do I stretch the strings?

You just need to play it and keep tuning it... because it is new, the strings aren't stretched out enough... the only thing that you can do it just keep tuning it and playing it and tuning it... I have a classic acoustic guitar that I just put new strings on and that is what I did... if there is a problem with the tuning pegs (like they aren't holding the string) take it to the Guitar Center in Pasadena [if you live in California]... but other than that... just keep playing and tuning it...