How do I login to Zee5, ErosNow, AltBalaji Premium apps that I installed on Amazon FireTV since I have AirtelTV Premium with AirtelThanks on 349 Plan?

I have Amazon Fire TV Stick attached to my TV and I am able to watch shows on the Amazon Prime Video as I have subscribed to Amazon Prime. I also have Airtel Postpaid plan which gives me free AirtelTV Premium which I can see on my smartphone. I can cast my Phone screen to my TV to watch Zee5, AltBalaji etc. from Airtel TV Premium app on my phone. However, I do not want to do that as it heats up my phone and drains battery quickly and and I even cannot use the remote to pause or play or skip a show as I have to attach the phone to the charger to compensate for the battery loss.

So, I have installed the Zee5, AltBalaji, Erosnow, Hoichoi apps on my FireTV Stick so that I can watch the Premium shows on my Smart TV using my AirtelThanks subscription. But I am unable to login to these apps on the Fire TV Stick with my Airtel Phone number or otherwise. So, it would be very helpful if anybody could guide me how to do that? Thank you.

No one has any idea how to do this? Airtel TV now has a web version but it does not have all the premium shows. Moreover, when I watch it inside a browser on the Amazon Fire TV Stick (after installing it - Firefox) the picture and sound quality is not very good. So, has someone any idea for the above issue? May be some work around? Anyone? Thanks again.