Students transfer money in Fintiba blocked account but they face difficulty during the source of funds step. Here I am going to give you some tips that will help you to complete this step (Fintiba Blocked Account Source of Funds) easily.
You will see this screen right after the money transfer. If the money you transferred is not earned by you then you can answer like this:

If the money you transferred is earned by you then answer according to your situation. These tips are for those students who take money from sponsors.
Now, if your sponsor (who gave you money) has a business (shop or any other business) then upload here the letterhead of the business. It doesn’t matter the business is registered or not. Simply upload the scanned copy of the letterhead.
If your sponsor is a salaried person then upload here his 3 or 6 months salary slips.

In the next step, upload your FRC (family registration certificate). If the sponsor is your relative or friend then print a relationship statement on a stamp paper and upload it here.

Relationship Proof I'm YOUR UNCLE/FRIEND, son of YOUR UNCLE/FRIEND's FATHER NAME, born on YOUR UNCLE/FRIEND's DATE OF BIRTH is the uncle/friend of YOUR NAME, son of YOUR FATHER NAME, born on YOUR DATE OF BIRTH. YOUR UNCLE/FRIEND's Name YOUR UNCLE/FRIEND's Signature YOUR NAME YOUR SIGNATURE
In this step, upload a copy of your sponsor’s bank statement. Better to upload a copy of a bank statement after the money transfer to Fintiba.

In the next step, write a ‘Sponsor Confirmation’ statement in Word, take the print, get the signature of the sponsor on this statement, scan it, and upload its copy in this step.

You can use this sample of confirmation of sponsorship. (Don’t forget to change bold text with your own information.)
Confirmation of Sponsorship I SPONSOR NAME, son of SPONSOR FATHER NAME, born on SPONSOR DATE OF BIRTH declare and confirm as follows: 1. That I am Father (what relation you have with your sponsor) of YOUR NAME, born on YOUR DATE OF BIRTH, Passport No.YOUR PASSPORT NUMBER. Mr.YOUR NAME is going for studies in Bachelor/Master in Computer Science at University Name for winter/summer semester 2021/22. 2. That I am a businessman (Proprietor of G Traders) from Punjab. I am earning money and put it into my son's account, Actually, I am aged now and don't know much about the banking system as well. So, that's why I ask my son to open an account by his name and maintain it by himself. Account no: YOUR ACCOUNT NUMBER. 3. That herewith confirm that, now, I give money for "student blocked account" with Fintiba for the purpose of his study to his bank account and from there he withdraws the money and sends it through National Bank. Moreover, his bank statement is attached in the statement section which clearly shows the identical amount. 4. That, I further undertake to bear all expenses of Mr. YOUR NAME during the period of his stay and study in Germany. I accept the full responsibility of all costs regarding travel, study, insurance, boarding, and loading expenses during his stay in Germany. Signature: (SPONSORS SIGNATURE) Date & City: 01.08.2021, Lahore
In the last step, upload a copy of your sponsor’s CNIC (Computerized National Identity Card). That’s it.

FAQs:
In Pakistan, you can get it from NADRA. In India, you can get it (Family Member Certificate) from Revenue Office. In other countries, contact a respective Government department.
If you are earning money on your own then select ‘yes’ in the first question. After that, upload details of your Freelancing Account (e.g Fiver account details) in the source of funds. In the end, upload your own bank statement (bank in which you are receiving your freelancing money).
You can write a relationship statement (see sample in the middle of the post) on stamp paper, sign it, scan it, and upload it in the FR section.