求救！英国签证怎样预约时间签证

亲们，谁能火速帮忙解答一下，有关英国签证的事儿...我完全是个门外汉...
容我弱弱的问一句哦，我知道要在网上填个申请表，但是预约时间要去哪里预约啊，有没有网址啊，还是发邮件预约时间呢？
怎样查询哪天可以预约签证？
江湖救急啊，很急...谢谢...

After your online payment, the website will be indicated, should be w w w.visainfoservices.c o m, please notice that if you wish to make your application in Dusseldorf, choose Germany  as your residence country, if you wish to pay extra sevices fee and provide your fingerprint in Amsterdam, choose Netherlands as your residence country.