You must view the content at least once, before it can be signed. Tap "View" and the content will be presented. Then close the content when you are finished.
Content Details with Esignature
After closing the content for the first time, A button that says "Submit Esignature" will be visible. Click "Submit Esignature," then read the text, which is set by your content provider.
After reading the agreement, type your password in the text field and click submit. If your password matches your user account, the content will be successfully signed and the status will be reflected in the content details page, as shown below.
Content Details with signed Esignature