英国续签问题

请问下大家，我看到英国美国领事馆写的是可以用waive 面试。

但是不是我还是要先预约呢？然后领事馆会通知是否要现场面试？你预约的时候不就已经安排面试日期了吗 不太懂
https://travel.state.gov/content ... mmigrant-visas.html
Applicants renewing a visa in the same classification within 48 months of the prior visa’s expiration are also eligible for interview waiver. This authority is in place until further notice.