Custom Designer

Hello I'd like to inquire about getting a custom designer to do a couple of amendments to my website. The main thing I would like is a form that allows users to login or register to my forum via email or google or facebook or twitter. I would like something similar to the drop down form that occurs when you press the login button on this website: http://www.mumsnet.com/ I don't mind whether the page is a drop down like on the website above or on it's own page, could I please have a quote for both? I would also like to have my social media icons showing in the primary menu next to the search bar. Could you please provide me with a cost for this work? My website address is www.musicfootballfatherhood.com Thank you Elliott