You can't force someone to like you back. Every one has their own personal prefrences and choices. However, there are some steps you can try. Firstly, get to know this person. Without knowing someone well you cannot easily determine if you like them or not. Secondly, talk to them about how you feel. Chances are they like you back but are unaware of how you feel. Hope this helps
If you like someone try getting to know them so you're sure you like them personally not just physically then if they like you they will try to form a relationship with you.
Tap that!
Try to get them to like you back or move on
only if you like them back
When you like someone that doesn't like you back the general response is to just get over it one day at a time, it's hard but you have to face it.
It means struck with the back of someone's hand, like a slap.
get a make over.
ask them out
Become close friends with him\her.
One thing you can do is: Probably to work around it until they like you back.
You should find someone who likes you for you and if they don't then they are not good enough for you.
Justbask him. Plain, simple
Ask him to go out with you