Could you let me know how and from where can i disable the this interest thing as i do not want the interest to be added automatically to my account balance without my consent. This will really help me and i can use this site with ease.

You can go to the profile tab, click the blue "disable lottery and interest" button, and then check the "disable interest" box.
I'm curious, can I ask why you'd want to do this? I'd love to hear your reasoning.
I have disabled both Interest and lottery from the profile tab as guided by you. The simple reason for doing this is that it is prohibited to take interest in our religion and hence i do not want this interest to be added in my money. That's the sole reason why i disabled the interest.
Even participating in the lottery is not considered good.
Freebitco is a site where you can earn from gambling, lottery, interests and faucets.
If you are not comfortable with these things, why did you make the account on this site on the first place ? Rather not signup on sites whose functionality conflicts with your religion.
I don’t think we should get into discussing religion here, but out of curiosity which religion is okay with gambling? so aren’t you already breaking the rule and Freebitco is neutral site which doesn’t promote any religion. Lastly we all will respect your wish, but don’t end up playing there and claim refund if you lose citing religion, I hope that you’re aware that Freebitco won’t entertain such claims hence use your account responsibly.
While I don't want to stray too far off topic, I read somewhere that religious groups believing in more than one God (e.g., Buddhists, Hindus) tend to have more positive attitudes toward gambling than people believing in only one God (eg, Christians, Muslims). But I agree with you; I don't think there are any religions that explicitly endorse gambling, and billions of people abstain from gambling out of their devotion to their religion.