You can put your link inside img brackets so it would be these brackets[ ]. put those where you see the word bracket, this one on the front [ and this one on the back ]
BRACKETimgBRACKETyour link hereBRACKET/imgBRACKET
or imgur also has the links for different imbedding for you. Put your cursor over your image on imgur, you will see a drop down arrow beside link as well as "copy". Drop the menu down, and choose "get share links". There you will have 4 options, you want the bbcode one.