Various modules can be edited. For instance, you can change the properties of your LATEST ACTIVITY module so it displays a certain muber of items, how much detail is in each one, how many characters to display and what kinds of activity get displayed.
To open any module for editing, click the EDIT button on the right hand side of the module. The picture below shows the otpions available in the LATEST ACTIVITY module::
To edit or update your profile information, click the EDIT button on your PROFILE INFORMATION module and you will be taken to a page called MY SETTINGS:
On this page, you control a variety of things. When you are finished updating, click the SAVE button at the bottom of the page and you will be returned to your profile page.
Some modules are able to be edited, some aren't. The ones that are always have an EDIT button on them to indicate that they may be atered or configured in a different way.