The Helium Network site outlines the various pools you can join to Stake your options. They preface the list with the below statement letting you know that any risks are on you when deciding to send your HNT to one of these pools.
See which Pool I staked my HNT with first, why I chose them and receive a 10% discount on fees with the link provided below.
As you can see there are numerous Staking Pools to choose from and commissions can be confusing. After registering and experimenting with several providers I chose to stake my HNT with a middle of the road priced pool that was easy to use and had a zero lock-up period.