Are you tasked to create a link, or know as CustomAction, on the Site Settings page of a SharePoint Online site in Office365? Nothing to worry! The following steps would provide you a guidance.
1. Initially, using Microsoft Visual Studio 2010, let us create an Empty SharePoint Project. In this demonstration, we will name it Office365.
2. As illustrated below, we need to create a Sandboxed solution. SharePoint Online tenancy in Office 365 only supports Sandboxed solutions.
3. Now we will create an Empty Element. In this demonstration, we will name it CustomAction.
4. Let open the Element.xml file we have just created and write the following code. MSDN, at http://msdn.microsoft.com/en-us/library/ms460194.aspx, has provided us a comprehensive description of every attribute below.
Moreover, the list of Custom Action Location and IDs are available at http://msdn.microsoft.com/en-us/library/bb802730.aspx.
Of course, using Microsoft Visual Studio 2010, we need to package our solution.
5. At this point, let us open the Site Settings page of our SharePoint Online in Office365. As highlighted below, let us open our Solutions page.
6. On the Solutions page, let us download the WSP file of the solution we have just created.
7. Now, let us open the Manage Site Features link.
8. On the Features page, let us activate the feature we have just uploaded.
Since, I have changed some of the default values of the solution we have created (the changes I have made are not essential and I have not included them in this demonstration), you might have a different feature name, icon, and description in your implementation.
9. Upon successfully activating the feature we have created, we could now enjoy the presence of a custom action link on the Site Settings page of our SharePoint Online in Office365.
For more information on SharePoint Online Programming for Office365, please visit http://msdn.microsoft.com/en-us/library/hh147180.aspx.