Your partners have access to: their budget lines, their current and historical activities, the create-a-new-activity submission form, and an interface that allows them to change their password.
Yes. In either case, the mouse-over highlight signifies that an item is clickable for editing and additional functionality purposes. Usually clicking on a yellow highlight will allow you to make an edit, while clicking on a blue highlight will open up an area for additional inputs.
Yes, if you have the correct permission, you may edit emails beneath the System Admin menu item, and then selecting Tool Options.
Partners only see their own activities and budget lines; admins see the partners and budget lines with which they are associated. Please refer to channeladmin_faq for instructions on how to set scope.