The best way is to fill out your rental application online via our website. My dad has agreed to cosign a lease with me but I am afraid my application will just be thrown out since I cannot provide a credit score or any proof of income.All co-signers must also complete the rental application, submit the requested attachments, and pay an application fee. If a co-signer or guarantor is required, they must submit a separate application and application fee. Com or ask your property manager about Leap. 1. Fill out the entire application completely and legibly (be sure to sign it!). 2. You can ask a family member or someone you trust to act as cosigner. Written screening criteria will help rental property owners attract qualified applicants and quickly identify applicants who do not qualify. Written screening criteria will help rental property owners attract qualified applicants and quickly identify applicants who do not qualify. To be a coapplicant, one typically needs to provide proof of income, undergo a credit check, and sometimes provide rental history information.