ADSL Router static IP Assinging

HI

My network IP range is 192.168.6.x.I reset my aztech router due to some problem. after that my lan users cant connect with the internet as i have assinged 192.168.6.2 to the router in DHCP of my server. Please help me that if i have to assign a static ip address to my router(If so tell me how to) or i have to check something else?
Thanks and regards