During your registration process, it is mandatory to read and accept the Terms and Conditions governing your access to the site or the use of the services offered through it.
In case you don’t agree with all the Terms, registration, login or any transaction won’t be possible.

Yes. Terms & Conditions can be modified and/or replaced, only after notifying you via a relative post on the site. You shall be responsible for reviewing and becoming familiar with the then-current Terms and Privacy Policy, by regularly checking for possible amendments in order to be sure that you agree with them. 
Your continued use of the site or any part of it after any modifications to the Terms and the Privacy Policy constitutes your acceptance of the modifications.