Retirement tax questions

...and now another related problem: I can view the Penalty Explanation form but TT will not allow me to print, nor can I find such a form on the IRS website.  Can I simply write my comments on a generic form (i.e. plain sheet of paper) and include it with the 2210 for mailing?  One other thing... I don't believe that I really need to file the 2210 at all, since there is no underpayment.  In fact, there was a major over payment.  Payment for the year exceeded liability and quarterly estimated payments each exceeded 1/4 of liability. What do you think?