1. In the sample letter, fill in your personal information. This sample letter explaining credit problems will help you focus your efforts when appealing to a property manager for an apartment.Sign on the signature line in the. This form must accompany documentation of financial support to cover your estimated cost of attendance for the first academic year of study. This certificate authorizes the holder to teach the approved area indicated on the certificate in grades 6-12. The letter must be on school letterhead and sent directly to AZBN from the educational institution.