What do the icons in the header mean and do?

User menu – Where you can load campaigns or manage your subscription
Help options – Where to go if you need some help or have questions
Campaign preferences – (Only for your own campaigns) – A number of options for the campaign, including sharing settings and access roles
Shared campaign access – If you have been given an access key from the campaign owner you can set it here
Refresh contributions – (Only when you are viewing a shared campaign with at least one contributor role) – Update all contributions for this campaign. Useful when other people are making contributions and you want to get the latest
Refresh the campaign – (Only when viewing shared campaigns) – Refresh all the campaign data. Useful when new objects are shared or details are updated by the campaign owner so you can see the latest