In short, there is two ways: The correct way and incorrect way. :)

If you want to know how guaranteed sign ups work, here's how it works.

First incorrect way:

There is a company that "hires" over thousand of people as their member and they are all "PAID TO SIGN UP". In short, this company pays $0.10 to $0.15 per sign up to a member. As long as member finishes sign up task, he is paid $0.10.

What does that mean? It means that these sign ups are NON-MOTIVATED sign ups. They sign up for purpose of making that $0.10 money.

Can you imagine your business getting this kind of sign ups? What good will it do to your business?

This is by far MOST popular method on Internet and it is most ineffective way to grow a downline business.

Allow me now to state obvious, success of any website is in direct proportion to amount of visitors it receives. If success is about visitors then why on earth would any intelligent business person devote 95% of their promotion time and budget to a single method of advertising their site?

Imagine for a moment you are advertising executive for a large automobile company. Your company has just released most economical car ever and your job is to make sure everyone knows about it.

Which of following would you do?

1. Place a full page ad in one or two car magazines, then spend next year rehashing and tweaking wording of that ad, because it wasn't creating sales you wanted.

OR

2. Advertise in every magazine and newspaper you can find, start national TV advertising campaigns, make sure you have slots on every commercial radio station in country, advertise on billboards, in cinemas, sponsor sporting events and what ever else you could think of.

It doesn't take a genius to work out second idea is a much better plan. Now this may come as a shock to you, but major search engines are not only source of visitors to your website. Many SEO gurus are quick to point out to you that search engines are only way to achieve substantial traffic. That is simply not true. One disturbing idea promoted heavily by SEO world recently is that "Links are dead" My answer to that idea is, if links were dead then there would be no web.

Links are how people travel web, whether they are text links, banners or email links to visit any site you need to click a link. Google itself is one enormous searchable link database.

Let's states something even more obvious. Google is not only site on web that links to other sites. There are directories, there are banner exchanges, and big one there are hundreds of millions of other websites. How many of those carry a link to your site?