Adding spouse name to Indian passport in Belgium

I would like to add my spouse name in my passport
I would like to know the procedure to do that. I came to know that I need to submit the online application form from the website https://passport.gov.in/nri/Online.do
But, when I tried to upload my application, marriage certificate I'am not able to do it
Could anyone please let me know if there is any other website with which I could do this

In order to add the spouse name to your passport, you need to apply for a fresh passport. If you are planning to do the same via Indian embassy in Belgium then
1. You need to fill the application online on https://passport.gov.in/nri/Online.do
Once filled, download the application and print it
2. Take your marriage certificate which carries a MEA apostille along with the old passport+photocopy, belgium residence ID+photocopy, 6 pictures which are 5.0cm x 5.0cm in size, application form and given it to the counter at the indian embassy.

If you dont have a specific need to add your spouse name now, you may wait till the next passport renewal date to do this.

I also hear that the spouse name field will eventually get removed from Indian passports.