How can I do Manual Entries?

My apologies, I am not quite sure what you are referring to be "Manual Entries".  If you are trying to update users submissions, that can be done by editing the submission from the submission view of your form:

http://www.jotform.com/help/269-How-to-view-Submissions

If there is something else youa re looking for, let us know a bit more detail regarding your requirements and we will be happy to assist you further.