Answer
The same way you asked her out on the first date.
The best way to get a second date with a girl is to just ask her to go out again. You also do not want to try and be overly eager about it.
'do you fancy going out again'. ask her when you feel comfortable. she will probably be waiting for you to ask her.
After dating the girl for the second time and you guys are done and it's time to go home, before leaving be like I think you are very fun and beautiful and I would love to take you for a second date, will you please. But keep one thing in mind make sure your first date with the girl was nice and fun and she liked it before asking for the second date!
Just how you get a date with any other girl-ask her out.
ask her to go out with u
In some cases it is OK to ask a guy out on a second date if the first date went well, but, sometimes it is better to let the guy ask you out unless you feel he is shy and perhaps he didn't think the date went well or he may think you don't like him. If you like him it is worth taking the risk of asking him out.
You ask her out.
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ask her!
First you have to find the girl you want then second you have to have confidence. Ask her, and if she says yes take her to the movies or out to get some icecream and converse with her make her laugh tell a joke. Then after the date you can walk her home or get picked up and drop her off, and ask for a second date.
ask Her on a date
The same way you asked her out for the first date. You can explain the delay if you wish. She may well ask why. Whether she buys your rationale or not is up to her.