From Online Manual
The help page located on the Main menu has a lot of similarities with this Using SMF - As a Regular User section here. But conveniently, admins won't have to link their members to here as the members can find help getting around SMF straight from the forum they are viewing. You will find a lot of handy guidance about getting around SMF as a user and how to understand how to use the features of SMF.
The biggest difference between the help section found on the standard SMF powered forum is it is more interactive and user-friendly. You will find by clicking on links you will be lead to examples on how to do certain things in a similar way as it is actually presented on a real SMF forum.
Although the documentation here is more specific in some cases, most notably the extensive profile, being completely documented here.