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Hi Lisa,

1/ Ribbon is not available in AutoCAD for Mac

2/ You need to clear check mark "Use Shift key to add selection" in the "Cursor & Selection" tab of AutoCAD Preferences window (menu "AutoCAD LT 2015" -> Preferences

3/ You can accomplish this the same way as in PC version. Clear all running object snaps on the "Object Snaps" tab of AutoCAD "Drafting Settings" window (menu Tools -> "Drafting Settings"). than choose one of the following methods:

   - use keyboard shortcuts NEA, END, MID, etc. when AutoCAD asks you to pick point

   - use right click context menu "Snap overrides" which is available inside most of drafting/editing commands

   - use OSNAP context menu inside drafting/editing command - you can activate it with Shift+right click or with middle click (if the system variable MBUTTONPAN=0)

   - create custom buttons for object snaps on Tool Sets palette and use them when you need

4/ About manual - I think you can try this:

http://www.infiniteskills.com/training/learning-autodesk-autocad-lt-2015-for-mac.html

Maxim