I cant access WP-admin of my WordPress some one answer me tonight plzzzz

I mistakenly changed the default URL of my WordPress and site from the general setting of my WordPress after doing this i am not able to access my wp-admin any more i have access to ONLY my ftp. Someone tell me any way to bring my site back i will be very thankful to him.
Kindly Some one answer me tonight I will be very grateful to him.