You can access and modify your Site Preferences from the menu available underneath your Name in the upper right corner:
After clicking Preferences, the Preferences which you can manage are divided into several categories.
Here we'll take a quick look at Miscellaneous Options:
Use the Market Watch List text box to add up to 20 symbols for stocks that you’d like to track on your Market News page. You should separate these symbols by a comma. Note: Mutual Funds will not show up on this list.
The next option (Submit bulk operation . . .) allows you to decide the threshold number at which point bulk contact options will be processed as a job in the background, allowing you to proceed with other work in your CRM.
After making any changes to these options, click Save Preferences in the upper right corner of the Miscellaneous Options widget and your preferences will be saved.