Givealittle "helpers" are extra people on your team whom you add as admins on your profile. Adding helpers to a profile is only available for Charity, School, group, and business profiles. This feature is handy when you need a bit of extra help with your Givealittle campaign, without having to hand over your login details to someone else.
These people have access to do pretty much everything you can do in the system (e.g. Add and Edit pages, reply to donations, view reports). So they can help with your fundraising.
Multi-Factor Authentication (MFA) is an extra security step when logging on. It gives added confidence that the person logging in is who they say they are. By default it is turned on for logins accessing your account, but you can choose to turn it off for specific people. About MFA