Edit my site

I have a site (currency exchange) and would like to make some changes in it. Demo Front-End: [login to view URL] Login: cohippisesa-9851@[login to view URL] Password: pauloteste Back-End: [login to view URL] Login: admin Password: admin The changes I want to make on the site are: 1 - The user can only login using e-mail and password. I want the user to be able to login using the username and password. 2 - I want to put 2FA as a security measure for users to login or withdraw money. 3 - I want to put on the site a book of offers for users to trade the coins with each other. In the book of offers will have currency pairs for the users to negotiate, for example: USD / EUR USD / BRL EUR / BRL BTC / USD BTC / BRL ETC... This way users can deposit money using any payment processor and negotiate with other users, then you can withdraw money to the payment processor you want. The site will profit a small fee charged on each order run in the book of offers. 4 - In the User Dashboard I want to appear the user's balance of the currency that the site has available. For example: USD - 0.00 EUR - 0.00 BRL - 0.00 BTC - 0.00000000 ETH - 0.00000000 DASH - 0.00000000 ETC... 5 - In the site we have the function of the user to exchange balance of one processor for another, I want to remove this. Instead of swapping the balance of one processor for another quickly, I want to put a user-friendly function to exchange a currency for another currency quickly if it does not want to place its order in the book of offers. His order will execute the first orders of the book of offers without him needing to use the book of offers. 6 - In addition to all this, my site has a license that limits its use. I can only use my website in the domain [login to view URL] I need to remove this license in order to use the site in any domain I want.