I'm in the process of helping a group in the PMO make their submissions for PMI Professional Development Units (PDUs). All PMPs need 60 PDUs during a CCR cycle so don't put it off until the last minute. In this case, they all participated in a workshop. If you want to collect PDUs, you're going to need some kind of evidence. It might be a program agenda, copies of a publication, transcript, certificate, registration form... do I need to go on? This is actually for you in the event PMI audits you. In this case, participating in a workshop, the evidence is not required to actually complete the PDU request online. Know your PMI ID #, Cert #, and Last Name on file with PMI.
Step 1: Log into the PMI homepage. A Membership Status box will appear in the left navigation menu with the following data: PMI ID No.: Member Since: Expires:
A Certification Status box will also appear in the left navigation menu with the following data: PMP No.: Earned: Renewal Date
Within that Certification Status box, at the bottom, is a link titled "View PDUs" 
Step 2: Select the " " link Step 3: Enter your ID#, Cert#, and first four letters of your last name Step 4: Select the "PMI PDU Self Report Form" radio button Step 5: Select the "Login" button to continue Step 6: Select the Activity you wish to claim ("2e" for participating in a workshop) Step 7: Complete the entire form (know the knowledge area and process group) Step 8: Select the "I Agree" checkbox and the "Continue" button Step 9: Review for accuracy Step 10: Select the "Submit" button
Go back and review your Online Transcript in a few days to verify your submission was successful Repeat Steps 1, 2, and 3
At Step 4, select "PMI Transcript" radio button Step 5: Select the "Login" button to continue to your Online Transcript
See, it's not as hard as you thought!