Menu: Tools -> Import and Export Settings
You can import your settings by going to Tools -> Import and Export Settings Wizard:
Import selected environment settings - let's you import a previously exported .vssettings file.
Clicking Next will give you the option to save your existing settings (recommended) before overwriting or just overwrite them:
Click Next and you will get to choose from the default settings or settings that have been saved previously or you can browse for your own .vssettings file:
Clicking on Next will let you choose what settings you want to import. All the previously exported settings are selected by default except for "Command Window Aliases", "External Tools List", and "Import and Export Settings" which are considered potentially dangerous:
Once you have selected (or deselected) the items you want and click Next it will import the settings and you will see this last screen: