When creating a campaign you can choose from two options: a pay-per-click option and pricing by follower range.
Pricing by Follower Range
First, you have to set an overall budget for your campaign. Then you have to set a fix amount of money for each follower range. Under each range you can see a suggested amount. Each amount has to be at least around 10 USD. We would advise to set higher amounts for higher follower ranges.