My Workflow Activities Channel 
In the My Workflow Activities channel, you can view your current approvals and your workflow history.
You can view any documents that are currently in a workflow phase that requires your approval. The Current Approvals link indicates the current number of pending approvals in parentheses.
You can only approve or reject a document if you are designated as an Approver in the document's collaborator list, or if the process template associated with the document's workflow indicates that you are an approver.
You can approve or reject a sourcing document directly from the Current Approvals report available from the My Workflow Activities channel. You can also approve a sourcing document from the toolbar of the document.
To approve or reject the document in the My Workflow Activities channel, do the following:
Choose Current Approvals.
In the report table, find the line for the document and choose Approve or Reject.
In the dialog box that appears, you can enter comments, select a reason for a rejection, and add an attachment.
Choose Finish.