Khalti Offer Fund:
Go to Mobile Application of Khalti, or login to www.khalti.com
You can find Offer Fund Option in the Menu or Upper row.
You have to fill the form.
Khalti ID: 9841061692
Remarks: Your Email address
(In the Remarks section, always mention the email address that you will use for participating in Exam)
After Offering Fund:
Go to Wallet section, there you can find Transaction History.
Click on the recent transaction you made, click on it.
You will find Id at the top of it.
Put this ID while filling up the registration form.