My website not working when i do not type www in address bar

when I type (my website)linkdresources.com without www in browser it shows blank page but when I type with http://ift.tt/2dGE3SJ then open completely how should i resolve this problem?

i hosted my website acually on herokuapp.com (linkdtry.herokuapp.com) and connect it with domain (http://ift.tt/2dGE3SJ) but now it's not working with (linkdresources.com)