You mean the RSform? you will need to ask this to them... (RSform people)

in our case, the affilaite tracker will show the registration form only if you point him to that page...

Once an affiliate is created, how to remove 'Request new affiliate account and link' as I only need to have one affiliate per user.

ah! ok.

well, you will need to make a code check to see if the user is already an affiliate, and if he is, hide the button.
this button is built in the file /components/com_affiliatetracker/views/accounts/tmpl/default.php

I've two different forms in my site(one for registered user and another for affiliates).If a person fills up the affiliate registration form(created using RSform pro joomla registration), then he is assigned to user group 'Affiliates'. I've another signup form which when filled up the user is assigned to user group 'Registered'. Registered users have access to all pages but affiliates users have restrictions to some pages. If I login as registered user I need to again fill up the affiliate registration form and login with that details in order to view affiliate area. Now what I need is if I login as registered user, I can be able to view the affiliate area without need of filling up the affiliation forms and all? How is it possible? How can a registered user be set as an affiliate ?

no, it's not possible without new code to be built.

I'm not sure to fully understand, tho.

you want that if a user registers as a "NORMAL USER", he is automatically added to the Affiliates area?

(I'm a bit confused because you're mentioning that you have A DIFFERENT registration form for affiliates..?)